While SEO has certainly changed and Google has gotten much smarter at determining what a web page is about, there can still be a lot of value in keyword research. The best keyword research tool varies from person to person.
Personally, I use it to determine potential value, for tracking SERP (Search Engine Results Page) features such as featured snippets, videos, and other listing varieties.
I also love to put in a competitors website and back out their traffic so I can get inspired to create more valuable content. I’m obsessed with longtail keywords for launching a niche website quickly.
There are free keyword research tools, paid tools, and “freemium” tools (free to a certain point).
Below, you can view and try various tools. I am an affiliate marketer and do benefit from purchases made through my links.