Keyword Research is an important part of SEO, if not the most important.
If your KW research is on-point, you can rank in practically any niche even without building any backlinks.
But if you pick the wrong keywords to start with, you are setting yourself up for failure because you can't make up for poor keyword research with content and backlinks.
I have been building websites and helping clients with their businesses for over 5 years now, and over the years, I have mastered the art of finding easy-to-rank KWs in basically any niche.
Here is what you can expect from this gig: