How you can make money online legally?

In internet, there are alot of opportunities for you to make money online legally. But, the question is how you can do this? Now, i tell you about Blogspot and google adsense. Google introduce blogspot, where you can start your on small business. This offer is free for the people all over the world. In this blogspot, you create your blog and write something informative for the people. For example: If your hobby is collecting coins. Then, you write about different countries coins. And your blog title is coin. Everyday, you make a new post and write about coin. If, you make a post about Pakistan coin. In the next day you want to make a post to another country coins.
If, your blog is interesting and match with google adsense policy. Then, you apply for google adsesnse. Google check your blog, see is it match with google adsense policy and check other information. Like, how many visitor use your blog. If blog traffic is high then definitely google approve your application. If, low traffic then maybe not approve your account. When your application approve, then you adjust the ads on your blog. Where visitor easily see it and click on it. When visitor click on the ads, then google pay you per click. The most important thing is you make a new post daily. And your visitor got a latest information.