If you can afford it it’s a good idea to buy a Raspberry Pi since Raspbian is basically just debian. Then replicate your current setup on it and just try to tinker with it without any risks of breaking things or losing data.
If you’re using a lot of Docker I would recommend learning the command line since you’ll be able to use Docker on basically any real OS at that point.
Lindybeige lost basically all credibility for me after the whole “Spandau” fiasco where he was trying to talk authoritatively about things he clearly didn’t understand or had any knowledge of. It really made me question whether he knew anything at all about the things that I didn’t know much about (pre-modern warfare mostly) and I ended up not watching another video of his after that.