Keyword research is the process of discovering the exact words and phrases your target audience types into Google. Without it, you are creating content in the dark — possibly writing about topics nobody searches for. This is the most important strategic step in your entire SEO plan.
Understanding the Four Keyword Types
Not all keywords are equal. Before building your list, understand these four categories:
- Head Keywords (Short-tail): 1–2 words. Example: "SEO services". Very high volume, extremely high competition. Avoid targeting these on a new site.
- Long-tail Keywords: 3+ words. Example: "affordable SEO services for small businesses". Lower volume, lower competition, higher purchase intent. Always start here.
- Informational Keywords: "How to", "what is", "why does". Great for blog content that builds authority.
- Commercial/Transactional Keywords: "Buy", "hire", "best", "pricing". Drive direct revenue but need domain authority first.
Step 1 — Build Your Seed Keyword List
A seed keyword is a broad term describing your business or service. From 5–10 seeds, you will grow a keyword universe of 50–300 targets.
- Think like your customer. For a web design company, seeds might be: "web design", "website development", "WordPress developer", "build a website", "mobile app development".
- Use Google Autocomplete. Type each seed into Google and note every autocomplete suggestion — these are real searches from real people. Example: "web design for..." → "web design for restaurants", "web design for small businesses".
- Mine the "People Also Ask" (PAA) box. These question-based keywords are ideal for FAQ sections and blog posts, and are excellent for featured snippet targeting.
- Check "Related Searches" at the bottom of Google results. The 8 suggestions shown are what users commonly search around your topic.
Step 2 — Filter Keywords by the Right Metrics
Once you have 50–200 keyword ideas, filter and prioritise using these metrics:
| Metric | What It Means | Ideal Target (New Site) |
|---|---|---|
| Search Volume | Monthly searches for this keyword | 100–5,000/month |
| Keyword Difficulty (KD) | How hard it is to rank on page 1 (0–100 scale) | Under 30 |
| Search Intent | What the searcher actually wants | Must match your page type |
| CPC | What advertisers pay per click — signals commercial value | Higher = more valuable |
If someone searches "how to do keyword research" they want a guide — not a product page. If they search "keyword research tool pricing" they want a pricing page. Putting the wrong type of content behind a keyword is one of the most common and damaging SEO mistakes. Google will not rank a page that does not match what the searcher actually wants.
Step 3 — The Four Types of Search Intent
- Informational — "I want to learn": Queries like "what is SEO", "how does Google rank websites". Create blog posts, guides, tutorials.
- Navigational — "I want to find a specific site": Queries like "Ahrefs login". Target your own brand name keywords here.
- Commercial — "I want to research before buying": Queries like "best SEO tools 2026". Create comparison articles and review posts.
- Transactional — "I want to buy or take action": Queries like "hire SEO agency". Create service pages and landing pages with clear CTAs.
Step 4 — Build Topic Clusters for Topical Authority
Modern SEO does not work one keyword at a time. Google rewards websites that demonstrate topical authority — deep expertise in a subject. You build this through topic clusters: one central "pillar page" supported by multiple related "cluster" articles that all interlink.
Pillar Page: "Complete Guide to SEO for Small Businesses" (targets the keyword "SEO for small businesses")
Cluster Articles: "How to do keyword research for small businesses" · "Local SEO checklist for small businesses" · "Best free SEO tools for small businesses" · "How long does SEO take for small businesses"
All cluster articles link back to the pillar. The pillar links out to all cluster articles. This signals to Google that your site is a genuine authority on the topic.