How to do keyword research for affiliate marketing

You can spend hours writing a helpful article and still attract the wrong readers—or no readers at all.

Keyword research helps you decide what to write before you invest that time. It reveals the questions people ask, the products they compare, and the details they need before making a decision.

For affiliate marketers, that matters because traffic alone does not pay a commission. Your content needs to reach someone with a relevant problem, help them make progress, and connect them with a product that fits.

In this guide, you will learn how to find keyword ideas, understand search intent, evaluate competition, and turn your research into a manageable content plan. We will use a beginner sewing website as a running example, but you can apply the same process to software, beauty, travel, home improvement, or another niche you know well.

The goal is to leave with a small set of worthwhile articles to create and a clear reason for each one.

What keyword research actually involves

Keyword research is the process of discovering and evaluating the words and phrases people use to search for information, products, and solutions.

A keyword can be a single word, a phrase, or a complete question. “Sewing,” “beginner sewing machine,” and “what sewing machine do I need to hem jeans” are all examples.

Useful research answers five questions:

1. Who is searching?
2. What are they trying to accomplish?
3. What kind of content would help them?
4. Can you provide something valuable compared with the current results?
5. Does the topic support your business and fit your audience?

Search volume is one input. It cannot answer all five questions.

Someone searching for “sewing ideas” may want inspiration. Someone searching for “best sewing machine for hemming jeans” is describing a specific buying decision. Both could become valuable readers, but they need different pages.

All keyword examples in this guide are illustrative research candidates. They are not claims of verified search volume, easy rankings, or affiliate earnings.

Step 1: Choose a specific audience and problem

Start by describing the person you want to help. This keeps your research from expanding into every remotely related topic.

“People interested in sewing” is a starting point. “Beginners who want to alter everyday clothes at home without buying more equipment than they need” gives you a stronger editorial direction.

That audience might need help with choosing a machine, understanding essential accessories, working with different fabrics, and deciding whether a repair is worth attempting.

Write a simple audience statement:

I help [type of person] accomplish [specific outcome] while dealing with [important constraint].

For example:

I help beginner home sewists repair and alter everyday clothes with a modest budget and limited space.

Now identify products that could reasonably support that outcome: machines, needles, fabric scissors, measuring tools, or beginner instruction.

Treat these as possible product categories. Check actual affiliate availability and program terms separately. A relevant product is worth considering even when it does not offer a commission; your recommendations need to remain useful to the reader.

Step 2: Build a list of seed topics

Seed topics are the broad ideas you will use to discover more specific searches.

For our example, start with:

• Beginner sewing machines
• Clothing alterations
• Sewing supplies
• Sewing in small spaces
• Denim repairs
• Learning to sew

Then expand each topic using the situations your audience encounters.

These phrases give you something concrete to investigate. At this stage, you are collecting possibilities rather than choosing article titles.

Try combinations involving the reader, task, budget, experience level, material, or environment. Avoid mechanically adding every possible modifier. A phrase should describe something a real person would want to know.

Step 3: Collect the language people actually use

Your audience may describe a problem differently from a manufacturer or industry expert.

A product page might discuss “heavy-duty construction.” A beginner might ask whether a machine can sew through the thick seam at the bottom of their jeans. That difference can shape a much more useful article.

Look for language in search suggestions, public community discussions, product questions, customer reviews, video comments, and questions your own audience sends you.

As you read, record the underlying concern. For example:

• “Will this fit on my kitchen table?” suggests a space constraint.
• “Do I have to buy special needles?” suggests uncertainty about additional costs.
• “Will I actually use all these attachments?” suggests concern about unnecessary features.

Use these observations to form candidate searches. A community question is evidence that someone has that problem, but it does not establish how many people search for it.

Google also cautions that autocomplete is filtered and influenced by factors such as location and search history. It should not be treated as a ranking of the most popular searches. See Google's explanation of Trends and autocomplete.

For a first research session, aim to collect around 30 to 50 relevant candidates. That is a practical stopping point for review, not an SEO requirement.

Step 4: Identify the intent behind each keyword

Search intent is the purpose behind the search. Understanding it helps you choose the right type of page.

These categories are useful working labels. Some searches have mixed intent, and intent can change with context.

Search each serious candidate and examine the results. If the results are primarily product listings, a long educational article may be a poor fit. If they are mostly demonstrations, you may need original images or video to answer the question properly.

For an affiliate site, commercial investigation is often a natural fit because the reader wants help choosing. Informational content also has a role: it can demonstrate your knowledge, solve an immediate problem, and introduce a relevant comparison when the reader needs it.

A tutorial about hemming pants should explain the process. Recommendations belong where equipment affects the outcome, rather than interrupting every step with a sales pitch.

Step 5: Add data without letting the numbers make every decision

Now use keyword tools to add context to your candidate list.

You can begin with Google Search, Google Trends, and Google Keyword Planner. Once your site has search visibility, Google Search Console becomes especially useful because it reports on your own website.

Search volume

Search volume estimates how often a term is searched within a specified market and period. Record the country, source, and research date alongside the number.

Google Keyword Planner's average monthly searches include close variants and depend on the selected location, network, and date range. The figures are rounded. They represent searches, not the number of visitors your article will receive. Google explains these metrics here.

Do not add the volumes of many closely related phrases and assume the result is a unique audience. Their demand can overlap.

Competition

Keyword Planner's competition column measures advertiser competition. It does not measure how difficult it will be to rank an article organically.

SEO tools may provide a separate keyword difficulty score. Each provider uses its own method. For example, Ahrefs describes its score as being based on linking domains to top-ranking pages. Use a score to help sort candidates, then examine the actual results. A low score is not a ranking guarantee. Read Ahrefs' explanation of keyword difficulty.

Trends and seasonality

Use Google Trends to explore whether interest appears seasonal, stable, or changing. Compare equivalent locations and time ranges.

Its 0–100 scale represents relative interest, not monthly search counts. A value of zero can reflect insufficient data for a low-volume term. Google explains how Trends data is normalized.

For a seasonal topic, plan research and production before the buying period. Leave time to test products and prepare useful content instead of publishing hurried recommendations during the peak.

Access and cost

Google currently states that accessing basic Keyword Planner features requires completing account setup, including billing information. Review the setup carefully; you do not need to make launching an ad campaign part of this research workflow. Check Google's current access requirements.

You can still make a useful first content plan from search results, audience questions, and Trends if you do not want to complete that setup yet. Mark unavailable volume data as unknown rather than inventing a number.

Step 6: Inspect the search results yourself

The search engine results page, often called the SERP, shows you what is currently being presented to searchers.

Review roughly five to ten relevant organic results for each shortlisted keyword. Open the pages. A title alone does not tell you whether the content is strong or incomplete.

Record the dominant format, the audience served, the quality of evidence, and anything a reader still needs to know. Note the research date and target market because results vary.

For “sewing machine for hemming jeans,” you might investigate whether existing articles explain fabric thickness, needle choice, limitations, or the difference between occasional alterations and frequent denim work.

Your opportunity statement could be:

I can create a documented comparison for beginners who want to hem everyday jeans, with close-up results and clear limits for each machine tested.

That statement also tells you what the article will cost to produce. If you cannot obtain the machines or test them credibly, choose a different angle or clearly label your work as a research-based comparison.

Pay attention to the entire results page. Ads, shopping listings, videos, and AI answers may satisfy part of the reader's need before they visit an article. Ask what would make your page worth opening: a demonstration, an original comparison, a worksheet, or a detail that cannot be resolved in a short answer.

The presence of a forum does not automatically make a keyword easy. It may indicate that searchers value personal experience. Likewise, a short article is not necessarily weak, and an older article is not necessarily outdated.

Step 7: Evaluate the affiliate opportunity

A keyword can be relevant and attainable yet have little connection to a product recommendation. Another may describe a buying decision you are well equipped to explain.

For each candidate, ask:

• Does solving this problem naturally involve a product or service?
• Can I explain who should buy it and who should choose something else?
• Is it available to readers in my target market?
• Is there an affiliate program I can actually join?
• Are the commission terms, attribution window, and eligible purchases clear?
• Can I afford the research and updates this page needs?

Verify program details with the merchant or network. Do not assume that a competitor's affiliate link means the same terms or approval are available to you.

A simple revenue illustration

Imagine an article receives 500 visits in a month. If 20% of those visits generate a tracked affiliate click, that creates 100 clicks. If 3% of those clicks result in approved purchases, that produces three sales. At an average $20 commission per approved sale, gross commission revenue would be $60.

500 visits × 20% outbound click rate × 3% approved purchase rate × $20 commission = $60.

These are invented assumptions to demonstrate the calculation, not benchmarks or a forecast. Actual results depend on the audience, merchant, tracking, eligibility, returns, and other factors. Gross commissions also exclude your content and operating costs.

The exercise helps you see which assumptions matter. It should not be used to turn a search-volume estimate into a promise of income.

Step 8: Group related keywords into useful pages

You do not need a separate article for every variation of a phrase.

“Beginner sewing supplies” and “essential sewing tools for beginners” may belong on one page if the search results and reader needs substantially overlap. “How to thread a sewing machine” addresses a different task and may deserve its own tutorial.

A practical grouping process is to compare the searches, look for recurring ranking URLs and formats, and decide whether one page could fully satisfy both needs.

Here is an illustrative content group:

Connect pages where the next one genuinely helps the reader. Use descriptive link text that explains what they will find.

This gives each page a clear purpose and helps you avoid publishing several near-identical articles that all struggle to answer the same question.

Step 9: Decide what to publish first

Before scoring anything, remove topics outside your scope or beyond your ability to cover responsibly. Then rate each remaining candidate from 1 to 5 on four practical factors.

Add the scores out of 20, then review them alongside demand evidence and the strength of the search results. This is an editorial planning tool, not an SEO metric or a prediction of rankings.

A specific tutorial you can demonstrate well may deserve attention before a broad comparison that requires testing ten expensive products.

For a new site, choose three to five closely related pages you can produce well. A small, coherent publishing plan is easier to execute and learn from than an enormous list of unfinished ideas.

Step 10: Turn a keyword into a content brief

Research becomes useful when it changes what you create.

Before drafting, write a short brief that identifies the reader, their question, the evidence needed, and the action the page should help them take.

For example:

Working title: Essential Sewing Supplies for Beginners

Reader: Someone preparing to make their first simple clothing alteration at home.

Main question: What do I need to buy, what can I use from home, and what can wait?

Content approach: A practical checklist organized by task, with explanations for each item.

Evidence needed: Original photographs, examples of how the tools are used, and checked product details.

Important distinctions: Essential versus optional tools, hand sewing versus machine sewing, and tools that depend on fabric or project type.

Reader outcome: A short shopping list appropriate for their first project.

Commercial role: Relevant product recommendations where they help, including suitable options that do not earn a commission.

Related pages: The getting-started guide and a relevant first-project tutorial.

Choose a title that accurately describes the page. Use the main phrase naturally and cover related questions where they belong. There is no useful reason to force awkward repetitions into every paragraph.

For reviews, plan the evidence before the writing. Google recommends original research, meaningful comparisons, benefits and drawbacks, and evidence of experience. If you call a product the best for a particular use, explain your basis. See Google's guidance on writing high-quality reviews.

How to use AI during keyword research

AI can help expand an idea, organize a list, or identify questions to investigate. Treat its output as a working draft that needs validation.

Generate candidate questions

Use a prompt like this:

I am building an affiliate content site for beginner home sewists who want to alter everyday clothing on a modest budget. Suggest 30 possible search queries grouped by learning, troubleshooting, product comparison, and buying decisions. Explain the likely reader need behind each. Label all queries as unvalidated ideas. Do not invent search volume, difficulty scores, rankings, or affiliate terms.

Organize research you have collected

Once you have a keyword export or manually researched list, try:

Group the supplied keywords into possible article topics. Preserve the source metrics exactly. Explain which terms might share a page and which appear to need separate pages. Mark uncertain intent for manual search-result review. Do not add metrics that are missing from the supplied data.

Find gaps in a brief

After reviewing competing pages yourself, try:

Review this content brief and my research notes. What decisions would still be difficult for the reader? Suggest evidence, demonstrations, and comparison criteria that would make the article more useful. Distinguish observations supported by my notes from your hypotheses. Do not claim we have tested products.

Keep the original data alongside any AI summary so you can check it. A confident explanation is not proof that a search has meaningful demand or that a page will rank.

How keyword research relates to AI search

People may ask an AI search tool a detailed question such as, “What sewing machine makes sense for a beginner in a small apartment who mainly wants to shorten jeans?”

That question combines an audience, a setting, a task, and a purchase decision. Your research should help you understand those details, even when a traditional keyword tool does not report the exact sentence.

Google says the established SEO fundamentals remain relevant to its AI search features and that no special optimization is required for AI Overviews or AI Mode. This guidance is specific to Google; it does not establish the rules for every AI platform. Read Google's AI search guidance.

Our practical recommendation is to make answers clear and substantiate them. Explain the conditions under which a recommendation applies, show your evidence, and make important information easy to find. No article structure or keyword technique guarantees an AI citation.

Measure what happens after publishing

Keyword research continues once readers can find your content.

Use Google Search Console to review the queries and pages generating impressions and clicks. Its Performance report also includes click-through rate and average position. These figures describe search visibility, not affiliate sales. See Google's Performance report documentation.

Then connect that view with your website analytics and affiliate reports. Track page visits, outbound affiliate clicks, approved conversions, and commissions where your tracking setup supports them. Use permitted page-level tracking identifiers when available; do not assume you can attribute every sale to an individual organic keyword.

Review patterns rather than reacting to every daily change:

• Impressions with few clicks: Investigate the query, position, title, intent, and result layout before assuming the headline is the problem.
• Visits with few affiliate clicks: Check whether the recommendations are relevant and whether the reader is ready to consider a purchase.
• Affiliate clicks with few approved sales: Check product fit, availability, tracking, merchant performance, and the program's reporting delay.
• Unexpected relevant queries: Consider improving the existing page if they share its purpose, or creating a separate page if they describe a different task.

For a new site, the first review may reveal very little search data. Check that the page is accessible and indexed, continue publishing useful related work, and allow time to gather evidence. A monthly review is a reasonable working routine, not a promise that rankings will appear within a month.

Common keyword research mistakes

Choosing by volume alone. A large audience is useful only when you can serve it and the topic fits your business.

Treating every long phrase as an easy keyword. Specific wording can clarify intent, but it does not establish low competition. Inspect the results.

Confusing advertising data with organic ranking difficulty. Keyword Planner's competition column concerns advertisers. Keep it separate from your organic assessment.

Publishing a page for every variation. Group terms that describe the same need. Make separate pages when the reader's task meaningfully changes.

Copying competitor outlines without a contribution. Identify what you can demonstrate, clarify, compare, or explain better for your audience.

Choosing recommendations solely by commission. A poor fit weakens the article even when the payout looks attractive. Explain the recommendation and be transparent about affiliate relationships.

Presenting AI suggestions as measured data. Save the tool, market, and research date for actual metrics. Keep unsupported fields marked unknown.

Researching indefinitely. Stop when you have enough evidence to choose a few useful pages. Publishing and observing reader behavior gives you information another hundred keyword ideas cannot.

Your first keyword research session

Set aside one focused session to build a shortlist. Adjust this schedule to your experience and niche.

This is enough time for an initial shortlist, not a full market assessment or product-testing project.

For each shortlisted topic, record the keyword, reader need, target country, data source, research date, intent, existing or proposed page, evidence you can provide, affiliate relevance, and next action.

If you cannot explain why a topic belongs on your site, put it aside. If you can explain the reader's problem and show how you will help, you have a strong starting point for content worth creating.

Start with one audience, one real problem, and one article you can make useful. Then use the response to decide what deserves your attention next.

Keep going

Once you have a shortlist of topics, pressure-test the products behind them with how to choose your first affiliate product, and use what to track before making more content to review what your first pages actually do.