I started with Google's Keyword Planner. It's free and gives you a good idea of search volume and competition. Great place to begin.
 
One thing that helped me was focusing on buyer intent instead of just high-volume keywords. It made a noticeable difference.
 
I recommend looking at what keywords your competitors are targeting. You can get some useful ideas from their campaigns.
 
Search intent is probably more important than search volume. A keyword with fewer searches but stronger intent often performs better.
 
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