I'm just an intermediate, but here's my cent.
Â
1) Protect your pieces. Always do this. If you do a dumb mistakes (which is likely on chess), you'll atleast gain a little something by protecting your pieces.
2) The pawns are important. My suggestions if you're an aggressive player is to attack with your pawns, and user your minor pieces to attack the king meanwhile.
3) Study an opening for black and one for white. If you don't want to study them, watch some games of your favourite GM and use the openings you like. Practice them a lot. Many say that knowing an opening well won't help you at all, but that's not right to me: it helped me by atleast 200 points. That's just because playing a bad opening means playing a very bad middle game, thus a bad end game.Â
4) Tactics. Do them a lot. I'll never stop repeating it.
5) Pawn structure. Learn it as it's very important. For example, you should place your rook to an open file.
Â
Don't go moving moves that aren't funny.
Â