Avoiding opening blunders


Advice choose an opening to play and after ever game look where you could have improved or your opponent, use a database like chessbase or scid to save your games "small bits"

Chess Openings Resources for Beginners and Beyond...
https://www.chess.com/blog/RussBell/openings-resources-for-beginners-and-beyond
You don't have to learn them all....choose one that you enjoy playing as White and two that you enjoy playing as Black (i.e., against 1.e4 and 1.d4, etc.).....try to learn them as well as you can....keep playing them until you have. At your current level, almost any reasonable opening is a candidate - choose ones that appeal to you.
Don't focus on memorization.....that's futile in the long run......instead, try to understand "why".....i.e., focusing on principles, themes and plans.
You might discover openings of interest here...
https://www.chess.com/blog/RussBell
You might also check out GothamChess.....for some openings ideas...
https://www.youtube.com/watch?v=rmbU97iftC8&list=PLBRObSmbZluTpMdP-rUL3bQ5GA8v4dMbT