Which free tools do you rely on for keyword research, and how far do they get you?

Google describes Keyword Planner as a free resource to help advertisers build keyword lists for search campaigns, with tools to generate keyword ideas and estimate bids.
https://business.google.com/us/ad-tools/keyword-planner/
The full answer on free Google keyword research is here:
https://aiwebpageseo.com/blog/is-google-keyword-research-free
Do you use Keyword Planner, Search Console queries or something else when choosing what to write about?