Main Lines against U1000


You need to learn about solid moves rather than openings. With the under 1000 crowd, it's a blunderfest by both players.
Learn general opening theory. Opponents who do not know the openings are almost never going to follow the book lines. And once you get away from beginners, opponents who DO know a few of the opening lines are going to try to force you to do something different from your preferred moves. Until you get to a tougher crowd, if you follow opening concepts of development and pawn structure and center control etc instead of memorizing and expecting known responses, you will do much better.

Lol no one plays those openings till 1600+ I wouldn’t worry about learning openings till 1400+. For now learn basics and tactics.

Learn general opening theory. Opponents who do not know the openings are almost never going to follow the book lines. And once you get away from beginners, opponents who DO know a few of the opening lines are going to try to force you to do something different from your preferred moves. Until you get to a tougher crowd, if you follow opening concepts of development and pawn structure and center control etc instead of memorizing and expecting known responses, you will do much better.
+1

Here you can find most of what you need to know as an improving player about openings:
https://www.chess.com/blog/nklristic/surviving-the-opening-first-steps-to-chess-improvement
In short, opening principles is what you need to know until you get a lot stronger.
As for what to study, perhaps this general guide might be of use to you:
https://www.chess.com/blog/nklristic/the-beginners-tale-first-steps-to-chess-improvement