Dear Saadi200, I reviewed your profile and watched some of your recent chess games. Upon looking, I found out that you are missing understanding of basics, but you are trying to learn and that’s a good thing.
Before getting to suggestions, let’s watch one of your chess games played by black pieces.
Please flip the board to black side for a better view.
Opening Suggestions:
In above game, you are playing Scandinavian Defense, which is good, you have to learn opening theory, its trap and middlegame plans.
I suggest you that after capturing the d5 pawn, you should play Qa5, that way your queen will be active.
Find tutorial with Qa5 Scandinavian Defense on Youtube and Google, and also watch its traps because in some variations, if you don’t play well your queen will be trapped, so learn its traps before playing.
With white pieces, you should learn London System if you want to play d4 move and if you prefer e4, you should learn bishop opening.
Middlegame Suggestion:
Learn checkmating patterns and solve tactics with mate in one, two and three. These drills will help you to develop your calculation skills.
Endgame Suggestion:
In the endgame, you should look for creating passed pawn, and learn rook endgames. Learn pawn and rook and learn two pawns and rook.
Conclusion:
With black pieces learn Scandinavian Qa5 variation. For middlegame, learn and solve tactics. And for the endgame, learn rook endgame and try to create passed pawn. If you still have any question, feel free to ask.