The free way to do keyword research is by using Google predictive search. You can type anything into Google and Google predictive search will finish the sentence for you. Google predictive search is based on what the most popular search terms are for a specific phrase. The more advanced way to do keyword research is with paid SEO tools. My favorite keyword research tool is the "Keyword Planner" tool by Surfer SEO. This is a helpful keyword research tool because it helps you with both writing content and researching the best content to create in the first place.