which the topic will get the high traffic?

Any topic will get a lot of traffic. All you have to do is to do your SEO and study your keyword very well.

 

I think online business, entertainment these topic from get the high traffic.

 

I would say entertainment, the ones you have referred can all bring you tons of traffic, its all about the way you advertise your site.

 

"make money online" seems this keyword is magic that will be queried by a lot of newbie in adsense just like me.

 

Something that is controversial is a sure way to get tons of traffic.