One thing I like most in using Linux is freedom to choose Window Manager.
I moved from one to another and back to one again. There are a lot of WMs out there. Many of them are very few codes and small binary. So, I wonder can I build my own Window Manager by emulating or copying codes from an existing WM I like.
How can I build my own Window Manager? What do I have to learn?
Please suggest the webpages or ebook if anyone can.
thanks in advance.

I'd download the source for a window manager you like and start by building it, installing what you've built, and verifying that you can accomplish that part first. Next make a small change and rebuild to verify that you can do that step.

After that, start customizing.

Note that whatever programming disciplines you'll need will depend a minor amount on the language which the window manager is written in. Otherwise just learning how to program is a good starting idea.

For instance, if you can't even start by downloading the source, building it, and installing it without modification, then what you ought to do is read the documentation for the window manager and getting to the point where you can do those first steps.

Here is one.

Here is two

Edit: here is mine set up to my druthers/preferences.

Happy Trailz, Rok

i remember there used to be "the smallest window manager"... as a project to help others learn how to make one...

maybe this one:
http://incise.org/tinywm.html
https://github.com/mackstann/tinywm
https://wiki.debian.org/TinyWM

or have a look here:
http://www.xwinman.org/others.php

Have a look here:
http://www.linuxquestions.org/questi...ct-4175542914/

The code iz now up on github as well.