I cannot understand how my processor earns bitcoin, and who gives me it!?
The best way to find this out is to probably google it. I doubt most people here will explain it better than most articles do.
Simple answer:
I tell three friends that I'm thinking of a number between 1 and 100, and I write that number on a piece of paper and seal it in an envelope. My friends don't have to guess the exact number, they just have to be the first person to guess any number that is less than or equal to the number I am thinking of. And there is no limit to how many guesses they get.
It's explained more in-depth in the article with other examples & technicalities. ->
https://www.investopedia.com/tech/how-does-bitcoin-mining-work/