There are so many topics like this already.  IF you perform a search, you will find your answers.

How to earn bitcoin by sig campaign?
How to earn Bitcoin
The Bitcoin earnings guide for poor countries
how to earn bitcoin fast?
Can You Help Me? How to earn bitcoins? without buying a bitcoin.
How to sell stuffs online and earn Bitcoin?

 ...and if you are too lazy to read all of those then this is my recommendation to you

[LESSON] How to Earn 1 Bitcoin in a Week

 That's my favourite