Where to look in choosing a server for a unity3d project?

Question

Mobile development

Greetings!
I am looking for a server solution for my project (casual game) made on Unity3d to implement the following functionality:
1) User progress storage
2) Usage statistics
3) Loading new content into the game
Never done anything like this before,
Programming level:
scientific copy-paste
Maybe a good textbook, Ali a series of articles advise
Thank you very much in advance!

Answer 1

Parse for first and second. Any hosting or Amazon S3 for the third.