My favorite 3 cmd commands are as follows:
It reads and prints files to an output. My favorite commands is cat because I like cats!
It prints something to the screen. I like this command since it echoes hat you type. This was one of the commands I like first when I started with bash scripting.
I like how simple it is to make a directory without using the file manager or the mouse to wander around. Just cd command back and forth and mkdir command to do it!