Making money online

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I thought it was easy to earn extra money online, but it was not. Last week I have read that I could earn money via google adsense. I just have to create my website, and I got one from them for free. I used "blogger" to create one. After posting, I signed up for adsense account and enrolled my site. Unfortunately, I was not approved. I did another oner but still I wasn't approved. I have tried five time, still not approved. Initially due to insufficient content. After editing no definite reason were explained. How will I resolve this issue?