I'm stuck in ORM lesson

Silverstripe Version:
4.10

Question:

who here has a simple project that uses orm? Im stuck on orm lesson. I don’t know how it works. Can someone here provide a simple project with source code. thanks in advance

// Include any relevant code. If you have a lot of code, link to a gist instead.

Do you have any specific questions / problems? It’s a little hard to provide a lot of help without any detail.
The lessons should provide the general information about the ORM, can you share what you’re stuck on?