Iam alien to this crypto currency world.. please teach me

Im looking to learn the whole concept of crypto currencies as I’m a mechanical engineer and i was almost disconnected with the online community for last couple of years… AND HONESTLY I FEEL LIKE AN ALIEN… PLEASE TEACH ME OR GIVE ME SOME EBOOKS TO LEARN ABOUT CRYPTO CURRENCIES.

I’ll be happy to pay charges for genuine 1 on 1 training.

buy low, sell high

but on a serious note, where do you want to start? trading? mining?