Course about advance embedded linux file system
 

Where can I find online course about advance embedded linux file system:

1) Cramfs, squashfs,tmpfs,romfs . How to pack and unpack each fs , and what is the target of each fs.

2)how to write/burn each fs to flush (flashcp,nandwrite...)

3)Example of linux embedded that I can buy (with telner/ ssh open) and understanding when I see all mounted partition what is the target of each mount fs by type of the fs.

Where can I find a good material for that??

The internet if full of sources for information. Each filesystem you mentioned has a web page so start there. Once you know stuff then you can usually just use "man" command.

I don't get #2

There are only a few sources that I know of for commercial embedded linux. There are some free sources. See distrowatch maybe to start.