help me about niche plz

i want to work in a niche for channel tv frequencies but i cant analyse that niche so anyone can help me to know if it is easy or not

Just use the Google search page and insert your mainstream keywords. you can see some results which are exactly or related pages will be shown in front of you. Analyse some websites and their keywords. Then you will get some thought that what you are going to do.

And if you find exact match keywords' based site are more than 5 and are authority sites then it's highly tough to rank for those keywords. And in case you don't find any exact math or 1-2 normal exact match sites then it's a green signal.