fine against cpus, destroyed online in smash ultimate

save replays of the games you lose and watch two or three back. you'll see yourself doing the same thing again and again, like always jumping out of shield or always getting up from ledge the same way. the person beating you already spotted it. you just need to spot it too.

cpus don't adapt, people do. a level 9 will walk into the same punish forever, a real player notices what you always do after grabbing ledge and just waits for it. what helped me: roll a lot less (it's the most punished habit online), play wired if you possibly can because wifi input delay is brutal in this game, and learn 2 or 3 moves that are actually safe on shield for your character. the first couple of weeks feel awful for everyone, it does get better.