Niche Website or Website about Everything?

[EasyKnowledge]

Hello, I plan to make a website and I want to implement google adsense in it.
I was reading on the net and i found that many people advice to make website specificaly about 1 niche or to find your niche before building website... But i thought to make website with many categories to maximize my adsense income... So my question is: Is it better and more profitable if I make website only about one Niche, or to make website with multiple niches ( multiple categories ) so I can add one niche in every category. I tried this at my blog
So if you have some advice for me on this question please post it... Thank you in advance!

[raven1083]

try to focus on the niches that you like the most that will help you make better content and update regularly