Google it for more research and help .
Take any Seo tool ahrefs or Semrush ( free you can use Keyword planner however the data is more aligned for PPC then Seo ,Try ubersuggest or any other free resource you can get on the internet )
Now don’t limit to any number on the excel sheet .
Try to group them similar ones in one group
Basically I try it out for 3 variations
Long tail keywords
Now play with filters here
Check the volume,impressions , CTR
Figure out the low hanging fruit here with these filters.
Or u get all this data with any SEO paid tool with competitor data as well .That saves a lot of time and exhaustion on this activity.
This is the basic research that one needs to do.
Now there are various steps further more for optimization and CRO.
I would request others alao to share their process or startegies on Keyword researching
Thanks in advance