I am stuck

1. The opening principles (that is not the same as ‘an opening’, just google ‘opening principles chess’;
2. Don’t give away free pieces and pawns and take free pieces and pawns that are given to you;
3. Basic endgames (k vs 2 rooks, k vs queen, k vs 1 rook, backrank mate, supported mate);
4. Learn to analyse your own games with focus on the first 3 topics. It takes time to learn to apply those things.