"How to earn money online for students?" and almost half of the contents was all about Bitcoin. i
Problem is earning FIAT online and Bitcoin is pretty much the same, either you sell your skills for Bitcoin/FIAT or you beg (im not advising that) for Bitcoin/FIAT or you try to gamble Bitcoin/FIAT (im not advising that).
So no matter what "currency" you want to earn, you doing pretty much same things.
If you want to learn about bitcoin write andreas antonopolous in youtube.