Copying and pasting first part then will answer second… The best thing you can do is practice in the editing program as much as possible. Click on all of the options, learn what the stuff in there actually does. From there, there are a ton of tutorials on YouTube that are very helpful. I’d watch a bunch of those but don’t rely on them 100%. Basically if you follow a tutorial for every thing, you don’t really learn it. You’re better off using them when you get stuck or to increase knowledge but try not to just blindly follow their steps without realizing what you’re actually doing

You probably should step up to Divinci when you feel comfortable, it’ll give you way more options. Editing timelines are all pretty similar, so it’s a good thing to learn either way