Read the beginner tips lists.

Basically, they are guidelines on how to not give away games.

eg.

Knights are weak on the board-edges.

Control the centre.

When in doubt, advance a pawn.

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Use SCID and Stockfish to identify key moves in games that shift the balance. It may be a strong-move, or a blunder, but they are pivotal to the outcome.

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Practise lichess.org puzzles. Forks and pinning the king.

Also lichess.org/learn

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As a beginning player, dump your bishops early. If you can trade your bishops for their knights, do it.

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Don’t listen to random advice online : )

I’m a comparatively average chess player. Go to a chess club and get advice from someone skilled who can see exactly what level you are at.