Photography is a deep subject and I would suggest getting a handle on the basics and Youtube is going to be one of the best places to start. There is a ton of editing software out there and if you ask ten people which to use you will get ten different answers. There is free software, all the way up to professional programs that cost a substantial amount of dough. Are you editing on a phone, a PC, A Mac - laptop? All of these questions need to be answered first.
All that said, you gotta start somewhere. Are you looking to do just photos or photos and video?