[Q] Learning Linux Inside From Android topic

Hello & Happy New Year Everybody.
I'm pretty new to Android, so apologizing for any mistakes.

Now, My question is,
Is it possible to learn linux inside from android devices?
(Just using the android device. Purely Android Device [I Insist].)

Additional Info:
Please notice, this is not about android development.
This is about learning linux based operating systems inside from android.
This is purely about, learning linux based commands and their usage to learn about linux based operating systems.

More Additional Info:
My device is rooted.
I've got "BusyBox" installed.
I also have "Terminal Emulator" installed.
Ready to install any other apps required.

Thanks all. :)