What terms are people searching for?
If you're struggling to think of more keywords people might be searching about a specific topic, go to google and take a look at the related search terms that appear when you plug in a keyword. When you type in your phrase and scroll to the bottom of google's results, you'll notice some suggestions for searches related to your original input. These keywords can spark ideas for other keywords you may want to take into consideration. You can read more about it here
Keyword research is a process bloggers and content marketers use to discover which relevant search terms are being typed into the major search engines like google. These commonly searched words and phrases give content creators a good indication of what people are searching for on the internet and thus which topics to write about in order to bring those readers to your website.