I use a variety of different tools to do keyword research, including the Google Adwords Keyword Planner, the Google Search Console, and the Moz keyword explorer. The Google Adwords Keyword Planner is a great tool for finding keywords that are being used by people who are actually looking to buy something. The Google Search Console tells you what keywords people are using to find your website. And the Moz keyword explorer tells you how difficult it will be to rank for a particular keyword in Google.