Learn how to decompile?

[SushiInYourFace]

Hi!

I'm looking for a new, long-term project to keep me occupied for a while, and I think that decompilation may just be the right mixture of repetition and skill to satisfy my desires. One problem though: I have no real idea how to start learning how to do this. I have a solid grasp on programming in general, and assembly in particular (although most of my knowledge is ARM), but as far as learning how to use Ghidra, how to get off the ground with a project, or how to even set everything up, I'm clueless. Is there any guide anywhere I can use, or any tips that anyone may have on how to kick this off?