Honestly, if all you've ever experienced in regards to terminals is windows CMD, then you really haven't seen much. I mean that possitively. Actually, it will give you a far worse impression on what using a Linux / Unix terminal can be like (speaking as someone who spent what feel's like years in terminals, of which the least amount in windows CMD).

I suggest to simply play around with a Linux terminal (e.g. install VirtualBox,.then use it to install e.g. Ubuntu, then follow some simple random "Linux terminal beginner tutorial" you can find online).

Don't worry about the terminal until or unless you have something to do that needs it, then follow a guide

Incidentally if a guide tells you to run a program in terminal, you can check what that program is supposed to do

• man command (eg. man mount) gives you the manual, if it has a manual
• command -h or --help gives you the command's help page - pipe it through "less" if it's more than a single screen eg: ls -h | less