What Is a Keyword — and Why Does It Matter?
A keyword is any word or phrase that someone types into a search engine. It might be a single word like "SEO," a short phrase like "SEO tools for agencies," or a long, specific question like "how do I fix a crawl budget problem in Google Search Console."
Every piece of content you publish should target a specific keyword (or a small cluster of related keywords). Why? Because without a target keyword, you don't know:
- Whether anyone is actually searching for what you're writing about
- How difficult it will be to rank for that topic
- What format of content Google expects to see for that query
- Whether the traffic would be commercially valuable to your business
Keyword research answers all four of these questions before you invest time writing a single word. It's the difference between creating content strategically — with a clear ranking target and a realistic path to the top of search results — and creating content randomly and hoping for the best.
The Four Keyword Types — and When to Use Each
Not all keywords are equal. They differ in length, specificity, search volume, and competition level. Understanding these differences shapes your entire content strategy.
The Three Metrics Every Keyword Must Be Judged On
When evaluating a keyword, you need three pieces of data: search volume, keyword difficulty, and search intent. Volume without feasibility is useless. Feasibility without commercial intent wastes your effort. All three must align for a keyword to be worth targeting.
1. Search Volume — Is There Real Demand?
Search volume is the estimated number of times a keyword is searched per month in a given country. It tells you whether there's actual demand for the topic before you invest in creating content about it.
Volume thresholds to know: 0–50 searches/month is micro-niche but highly specific and very convertible. 50–500 is solid for long-tail targeting. 500–5,000 is mid-tail territory — meaningful traffic if you rank. 5,000+ is mid-to-head territory with proportionally higher competition.
Important caveat: don't dismiss low-volume keywords. A keyword with 100 monthly searches that perfectly describes your service, with clear buying intent, may be worth more to your business than a keyword with 10,000 searches from general informational searchers who were never going to become customers.
2. Keyword Difficulty — Can You Realistically Rank?
Keyword Difficulty (KD) is a score (usually 0–100) that estimates how hard it would be to rank in the top 10 for that keyword, based on the authority of the pages currently ranking. It's not a perfect metric, but it's an important filter.
| Difficulty Score | What It Means | Best For |
|---|---|---|
| 0–20 (Easy) | Few strong competitors — achievable for newer sites | New sites, quick wins, long-tail content |
| 20–40 (Medium) | Some competition — achievable with good content + some links | Sites with 6+ months of SEO work |
| 40–60 (Hard) | Strong competitors — requires significant authority & links | Established sites with solid backlink profiles |
| 60–80 (Very Hard) | Dominated by high-authority sites — long-term project | Ambitious targets after 12–18 months of work |
| 80–100 (Near-Impossible) | Major brands and national publishers — rarely achievable | Brand awareness only, not realistic ranking targets |
3. Search Intent — Does This Traffic Actually Help Your Business?
We'll cover search intent in full depth in Lesson 3, but as a quick primer for keyword evaluation: intent describes what the user wants to do with the search. Informational keywords (how-to, what is, explained) bring research-stage visitors. Commercial keywords (best, vs, review, alternatives) bring comparison-stage visitors. Transactional keywords (buy, price, order, sign up) bring ready-to-act visitors.
When building your keyword list, match the intent of each keyword to what your page can deliver. Commercial and transactional keywords drive the most direct business value — but all three intent types have a place in a complete content strategy.
The Keyword Research Process: Step by Step
Here's the exact process to follow for any new keyword research project:
Free Tools to Start Your Keyword Research Today
You don't need expensive tools to start keyword research. These free options give you real data and are perfect for beginners:
- Google Search (Autocomplete) — Start typing your seed keyword in Google and watch the autocomplete suggestions. These are real queries people are searching, ordered by popularity. The "People Also Ask" boxes and "Related Searches" at the bottom of results are gold mines of related keywords.
- Google Keyword Planner — Free with a Google Ads account (you don't need to run ads). Shows search volume ranges and competition level for any keyword. The volume data is grouped into ranges rather than exact numbers on the free tier, but it's still highly useful for prioritisation.
- Ubersuggest (free tier) — Provides keyword volume, difficulty scores, and content ideas for up to three searches per day on the free plan. Good for quick research on specific topics.
- Google Search Console — If your site already gets organic traffic, GSC's Performance report shows you every keyword people use to find your site. This is some of the most valuable keyword data you can get — it's from real searchers who found you.
- RankTracker (free tier) — Rankar's own keyword research module, with search volume, difficulty, and intent data. Includes competitor analysis so you can find keywords your competitors rank for that you don't.
Building a Keyword List That Actually Gets Used
The output of keyword research is a prioritised keyword list — a spreadsheet with columns for: keyword, monthly search volume, keyword difficulty, intent type (informational/commercial/transactional), and the page you will target it with (existing or new).
Structure your list into three tiers based on difficulty:
- Tier 1: Quick Wins (Difficulty 0–25) — Target these immediately. They can rank within 60–90 days with a well-written, properly optimised piece of content. Start here to build early momentum and prove your strategy is working.
- Tier 2: Growth Targets (Difficulty 25–50) — Work on these in months 2–6. They require more content quality and some link building, but they're achievable for most sites with consistent effort.
- Tier 3: Competitive Goals (Difficulty 50–70) — Long-term targets for after 6–12 months of authority building. These keywords have significant traffic value and justify sustained investment.
A realistic content calendar has a mix of all three tiers running simultaneously. Quick wins give you early traffic and motivation. Growth targets build your authority profile. Competitive goals represent your long-term ranking ambitions. The balance keeps your strategy both achievable and ambitious.