Now this sometimes can be tricky but here are some of my tricks what I do and how I find top niche suggested keyword.
First of all why do we need niche keyword?
Well if you want to make money from blogging you are going to need a topic, you need to know, is that topic worth of writing about ? How many competitors are there ? What are their statistics and such?
Those are all small things you need to make sure you are familiar with before you even buy domain name and start blogging.