You have asked few questions in a few different posts so far but im gonna respond to this one in particular.
First off, if there are people who are actively interested in getting better i'd be happy to play sometime and do some 1v1s and see if I cant give any advice/pointers
Now for the edge guarding question. Edge guarding is both incredibly simple and incredibly difficult. Simply put edge guarding is anything you to stop the opponent from getting back to the stage. Doing it is the hard part.
Being able to edge guard essentially asks a two questions
1. What tools does your character have to edgeguard?
2. What tools does your opponent have to recover?
To get answers to these questions, the fastest way is to go to character discords. For example, the ridley discord just finished a big weeklong discussion with the pichu discord where they they spent an entire day talking about this particular topic. Lots of matchups are still being discussed but there is still a ton of information done by people who are labbing all this out.
With all that being said, your ability to edgeguard is going to largely depend on how quickly and accurately you can answer those two questions stated earlier during any given match. There are alot of characters and alot of nuance to it all so thats where the "just play a ton" mindset comes in, because an incineroar recovering high vs a wolf recovering low are two very different situations.
To wrap some thoughts up here are some questions and practice ideas for ya.
Questions to ask yourself
1. Do you know every characters recovery works?
2. How far off stage can you and your character go and still make it back?
Practice ideas
1. Go to training and pick an opponent with a very straightforward/exploitable recovery
2. Pick any tourney legal stage
3. set them to like 60, hit them off the stage and try preventing them from getting to the stage/ledge.
See what works and what doesnt. Get comfortable with your tools and what you can get away with.
Hope this helps!
EDIT:
One of many examples of someone who knows the tools of their character AND how their opponent is going to try and recover
https://clips.twitch.tv/FaintImportantStarSSSsss