How to do keyword research SEO

Keyword research starts with understanding what your client's potential customers are actually searching for, then validating that those searches align with the client's business goals and current capabilities. Begin by brainstorming seed keywords—broad terms related to your client's industry, products, or services. Then expand this list using tools like Ahrefs, SEMrush, Moz, or the free Google Keyword Planner. These tools reveal search volume, keyword difficulty scores, and related queries that you might not have considered. Pay attention to question-based queries and long-tail variations, as these often convert better and face less competition than single-word searches. Search volume tells you demand, but difficulty scores tell you whether ranking is realistic given the client's domain authority and content resources.

The critical step most agencies skip is validating intent. A keyword with high volume might not help your client if the searcher's intent doesn't match what the business offers. If you're optimizing a local plumbing service, national keywords around "plumbing supplies" won't convert. Use Google's autocomplete, People Also Ask sections, and actual search results to understand what users really want when they search a term. Look at the current top-ranking pages—if they're all informational content and your client sells a service, that keyword might have low purchase intent. Segment keywords by intent: informational (someone learning about a topic), commercial (comparing options), transactional (ready to buy), and local (geographic-specific searches).

Finally, organize your findings into clusters that reflect your content strategy. Group related keywords together so one strong piece of content can rank for multiple variations. A single guide about "best email marketing tools" can target "email marketing software comparison," "affordable email marketing," and similar queries. Create a prioritized list that balances three factors: search volume, difficulty, and relevance to the client's business. Quick wins—keywords with decent volume but low difficulty—should typically be your starting point, especially for newer sites. This approach builds authority gradually while you develop the stronger content needed for more competitive terms. Keep your keyword research document updated quarterly, as search behavior shifts and new opportunities emerge.