My son is graduating from local community college with a AA degree in Radio/Television/Films. Prior to enrolling in this degree program he watched a lot of YouTube videos which showed him what software tools to use and also some great tricks to make attractive videos. The software tools you can download for free is Davinci Resolve and if you can afford ADOBE Premiere Pro use that too. Also, for networking browse to reddit.com where you will find a lot of resources.
Hope this helps and good luck.
Start at looking at classes. Online or perhaps in school. Coursera or LinkedIn Learning have options you can take to learn how to learn how to edit.
Beyond the mechanics of editing is learning how to do end the end goal. Actually craft a story. There are classes online and in school for this. If you are teaching yourself here are things to teach yourself:
Write a script. Make a script for a short 60 second commercial or story.
Story board and plan the shots for that script. Previsualize how you see the shots.
Plan the shoot for your script. What people or things do you need? Figure out locations and lighting. Does it require acting or rehearsals?
Edit the piece together according to your script and story board. Think though the script as a road map. It’s ok to deviate a little bit if the piece is better. Sometimes inspiration happens in the creative process. Make your piece exactly the set length you plan.
Then produce a how to video, a commercial, a documentary style news piece, and then a music video or artistic piece where you can be more open. In each it’s learning how all the shots and elements go to creating the entire finished piece. Can you hold the visual interest?