How do linode works

Linode has extensive documentation that will probably answer any of your questions. As it stands, that's such a broad question that no one's going to be able to answer it without writing a full edX course on the subject.

As @cyveris said, this question is a little too broad to provide a detailed response. With that in mind, I think these guides would be good places to start:

• Linode Beginner's Guide
• Getting Started with Linode

These are two great starter guides that help you understand how we're a little different than other providers and how to get a server up and running within minutes.