focus on one programs maybe the answer

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then answer is Google Adsense... More reliable and they proved it to me. Back 2-3 years, I'd earn about more than USD1k after six months but because of my nature of job i have to leave it unattended so so I'm BACK! but with new way, blogging... and maybe another website soon. But have to think what is the best topic to bring up... I mean the concept and my expertise... Anyone with me?