When you do a search on the main page of Google you end up with preformat suggestions as you type. This is a goldmine for keyword research. The only hitch is you are limited by one at a time research.
Answer The Public is a website based research tool that takes one only a a time keyword but returns hundreds of results phrased as question as potential keywords.
For example, when I type ‘xbox’ in Google, the first auto type that pops up is ‘xbox one x’. Yet on Answer The Public I get a whole range of content questions starting with ‘Are, Which, When, How, Why, etc’
The returns for potential keywords and content descriptions will certainly keep you busy!
Give it a try here and let me know how you feel about using the tool.