play off instinct
One chess advice you would give to every chess player?

One chess advice i would give to every chess player is to always be willing to learn and improve
Chess is a game with endless possibilities and strategies and there is always room to grow and develop new skills
Even the strongest players in the world continue to study and analyze the game to stay at the top of their game
So always be open to new ideas study different openings and endgames and seek out opportunities to learn from more experienced players

Get ready to play a lot of cheaters. Chess.com is horrible at policing it.
By reporting them its easy for them to police them

Analyze your completed games, especially identifying and understanding your mistakes and how you could have avoided making them.

If you do choose to sit on your hands then just don't fart on your hands. And make sure to wash your hands with soap and water afterwards
Alternatively, you could fart loudly just before offering to shake hands with the opponent.

My original "sit on your hands" suggestion was inspired by my belief that most blunders are caused by a player just reaching out, grabbing a piece, and making a move without checking first to see if it's a blunder.
So if you train yourself to:
1) sit on your hands until you have DECIDED on a move, and
2) always (always!) do a blunder check when you pull your hands out from under your butt
Then putting 1+2 together you will ALWAYS do a blunder-check before you actually make a move.
Mine: defend well before going for attack