How to do topic research for a blog

Topic research is the practice of breaking a broad subject into the specific phrases people search for inside it, so you can see which parts of the topic have real demand and which ones a site your size can actually win. It answers a different question than competitor keyword research: instead of starting from a rival’s domain, you start from a subject you already cover and find every angle inside it worth a post.

1. Pick a topic, not a keyword

Start broader than you think. “Cold brew coffee” works better as a topic than “cold brew ratio”, because a topic research tool needs room to surface subtopics you haven’t thought of yet: the ratio, the steep time, the equipment, the cost per cup, cold brew versus iced coffee. A single keyword gives the tool nothing to branch from.

2. Run a topic research tool

Open the free topic research tool.
Enter your topic, such as cold brew coffee.
Optionally enter your domain to see which subtopics you already rank for.
Select Find subtopics.

You get up to 20 subtopics with monthly US searches, keyword difficulty, search intent, and the questions Google shows for the topic, sorted with the most winnable subtopics first. Five checks a day, no signup.

3. Sort by difficulty before volume

A subtopic at keyword difficulty 15 with 400 searches is a post a small site can rank for this quarter. One at difficulty 70 with 4,000 searches is a post the established sites already own. Read the difficulty column first, and treat volume as the tiebreaker between subtopics you could plausibly win.

4. Answer the questions Google already shows

The tool’s questions list is Google’s own “People also ask” box for the topic. A post that answers each one directly, in its own heading, tends to rank without a rewrite later, because it already matches what a searcher wants. Skip a question that doesn’t fit your angle rather than forcing it in.

Keep a list, not a single post

Topic research works best as an ongoing list: research a topic once, pick the two or three most winnable subtopics to write now, and keep the rest for later, once the earlier posts have built some authority. If you want a full outline, secondary keywords, and what a competitor’s page already covers for a subtopic before you write it, GapDigest turns it into a post plan on every plan, including the free one.

If you already know which competitor you want to beat rather than which topic to cover next, see how to find competitor keywords for free instead.