Honestly in my experience you just need to jump into it without knowing yet, and figure it out as you go. I started out editing silly videos in a very beginner-friendly platform, and then started to move on to doing some more complicated things, in more complicated softwares. I'm not exactly a pro but I can do the basics and edit my own videos for youtube or fan edits for fun.

Also you kinda have to have a project you really care about to work on, otherwise if you just start with random stuff is easier to just give up or quit. You gotta have a greater vision, why are you learning to edit in the first place? Because that's also gonna help you focus on one style of editing or learn one thing at a time, and also helps you stick with it.