New to chess.com...

Find some materials that you like about basic principles. Try to avoid blunders, to leave hanging pieces, understand the value of every piece, develop in safe squares... and if you need more time to think, play longer time controls.

If you want some help I can help a bit, but I am no pro. I can tell you the very basic things.

Chessvibes has some very good videos about principles in youtube, if you want to check them out.

I would suggest you btw to play a game and link it here with some comment of yours (maybe your thoughts about the game, it must not be perfect, just jot down what you think in some moves) so that there is a starting point to understand if you blunder because of hurry-stress-whatever, of if you do not see the blunders even at a second glance after the game has ended.