I am studying linux and have read articles about Xwindow.

I am studying linux and have read the article about Xwindow. the more confused I am, the more I am. Linux general technology-Linux technology and application information. Here is the details. I read about Xwindow.
Xorg,
The more you get confused, the more you still don't understand it.

For example, X can provide a basic framework for the GUI environment: depicts and presents images and mobile app windows on the screen, and also accepts, executes, and manages interactions between the computer, the mouse, and the keyboard. However, X is not responsible for the user interface, but for other X-based implementations, the X-based environment has developed many visual styles. Different programs may present different interfaces.

This part cannot clearly understand how this process is, etc.

For example, the local X client --- ++ ------ keyboard
Remote X client --- | + | X protocol ---- X Server ----- hardware specification + mouse
Remote X client --- ++ ------ display

How does this graph work? After reading some documents, the text is too blunt to understand.

I believe that many new users like me will encounter such problems.

I hope you can give me some tips to introduce some simple and clear books or tutorials ......

Thank you