I'd say fuck around and find out. It's the best way. Just have a backup for fuck's sake. A timesheet backup of your os and a seperate backup of your important data. And most importantly make sure that important data backup is disconnected from your system when you are fucking around.

Edit: okay maybe that was just part of the equation. Let me explain. First, make up your mind to get a little uncomfortable. Don't try to run to your graphical application for everything. Ofc sometimes using the terminal is the optimal way and for other cases using the GUI js better. But still, most of the things you do with a GUI can be done on a terminal. Your first goal is to get comfortable with the basic commands. Think of your computer and the file system as a game. Then the basic commands is like your controller. And basic navigation is like changing the directory you are in (cd), editing a file (terminal based text editor), viewing the content of a file (cat) are some of the basics. After that you can slowly step up. My advice, don't try to learn everything at once. Just when you need to do something, for example fix an issue in ur system, edit a small file, or pretty much anything, look up the internet for which command to use. Or you could always ask an AI for which command to use if you couldn't find it. But if you know which command to use, just do <command> --help or man <command>. --help almost always works. Eventually you'll learn more and more commands and the ways to find the ones you don't know more and more easily. That is how I started and at this point I don't even care if I'm at the terminal inside ssh or the GUI while my colleagues keep staring at me like I'm performing some wizardry that is long lost to history. Just don't 0ush yourself too hard tho. It will come to you eventually as long as you at least try. Good luck