he made a thread that is mostly unanswerable. It's impossible to pull from the countless tips and tricks and pieces of info a falcon player needs to know. Threads like this aren't very useful. He shouldn't ask for general tips unless he has a video, which we can then correct, or if he has specific questions, like advice on certain matchups or combos.
In summary, you can't just make a thread called "teach me how to play falcon". That's what guides are there for. Read those, and when you have specific questions or want a video analyzed, post. ie, the first response literally said welcome, watch videos, learn to l-cancel, etc. Which applies to all characters, not just falcon. Perhaps the only actual bit of advice was proverbs telling him which players to look for when watching videos, but that's about it.
I have lots of players in my area who are trying to learn smash, and they know basics like l-canceling and stuff, but they want help playing the character. So i play them and give them running commentary on what they're doing right and wrong, etc. That's helpful. It's why a video is helpful. You can't give advice to someone without knowing what they need help with.