A small generalization for you I have prepared in the following lines. I would like to explain how I "make money online" and considering the interests mentioned, talking in general about how you can make money on the Internet is very easy for one who has some experience, but to put into practice is very very difficult for a beginner, if it was easy everyone would be making money online.
There are dozens of ways to make money online, you have to try as many of these methods until you reach the one that you like and that will bring enough money per month with minimal effort, in my case I tried many ways and I did not make some money but I got that experience, acquiring this experience I can today decide what is best that can bring me success on the net.
I'm not any expert, if I make thousands of dollars a day I could be, and I would have an Internet marketing course on sale, I could not tell you "gotta do that, that and that to reach 300-400 Euros per month ", when in fact there's hundreds of factors that influence success on the net. A small example: there are over 200 factors to rank a site in the largest search engine "Google" one more important if you have not considered and chances are you do not ever rank the site and therefore you do not money from it.