For anyone looking to learn Ghidra and finding it a little overwhelming, a Ghidra book was recently released. I'm finding it very helpful so far.
Part of the reason I keep saying this is, if you've done reversing work with IDA or Hopper, you can fumble your way to productivity with Ghidra without a book. So: if Ghidra is completely greek to you, start maybe with fundamentals.
https://maxkersten.nl/2020/09/13/a-review-of-the-ghidra-book...
It's a good introduction but does not venture far.