blog topics you recommend for earning more traffic

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Hi i am wanting to start an account at blogger.com and add my google adsense ads there. I was wondering if you have any tips of what content I should write? If i would write my personal life happenings won't i get much traffic right since people want information like health,entertainment etc? If i write a topic about health and then add a topic for my daily routine or add another topic like games is that okay? or should i stick with only uniform content? Like for example games topic all the way?