I do not recommend listening to any advice about learning Linux from anyone who’s used Linux for more than 5 years. This includes me, so don’t listen to what I’m about to say:
The best way to learn Linux is to just install it and use it on a computer you actually want to use daily. If you don’t know which distribution, just pick Ubuntu --you might find a different distro later, but don’t get stuck in analysis paralysis in choosing one to start with. When you’ve found your way around the GUI (Ubuntu loves that meta/windows key, so make use of that) then go pick up a bash tutorial to learn the command line.
Linux runs on everything from watches to supercomputers. The notion that there’s a single way to learn it or even a single incarnation of Linux you should learn above all others is laughably obsolete. Yes, it’s all unix underneath, but what’s actually relevant is how you use it.