Tips & strategy
In the opening, aim for three things and ignore everything else: put a pawn in the centre, develop your knights and bishops toward the middle, and castle your king to safety. Players who chase early material with their queen usually spend the next ten moves retreating it while the opponent develops for free.
Before every single move, ask what your opponent threatened with their last one. The overwhelming majority of games below expert level are decided not by deep plans but by one side simply not noticing that a piece was attacked. This one habit is worth more than any amount of opening theory.
Look for pieces that are undefended or stuck on the same line as something valuable. Forks, pins and skewers all come from geometry rather than calculation: a knight that can reach a square attacking both king and rook, or a bishop lining up on a queen with only a pawn in between. Scan for these shapes rather than trying to calculate every branch.
In the endgame the king stops being a liability and becomes a strong piece. Once the queens come off, march it toward the centre and use it to support your pawns. Beginners often leave the king tucked in the corner all game and then lose an endgame they were winning, simply because their king never joined in.