Domain name

Hello guys. It is me again. I have been reading this forum for a while and other websites with similar content too. In many results I have figured out that it is good to contain my main keyword in domain name and in other posts i have figured out that is not good. So what is your opinion? Thanks for every suggest.

PS: Sorry for my English.

You could rank any domain for any keyword! But if you going for micro niche site get a domain as close as posible to your keyword. If you are going to cover wider your niche, go for brandable one.