best openings for beginners? B&W?

What are the best openings for black and white for new players? Should I even be concerned with set lines? Should I prioritize just playing chess placing no importance on specific lines and openings? If so, around what elo does a player develop a sufficient understanding of the game to start using specific openings for black and white? tips to improve as a beginner?

Best not to focus on memorising lines and just learn a good setup/where pieces should go such as:

This is probably one of the most basic setups to understand from both sides.

The first openings I played were Italian with white and e5 as black.

These days I play exclusively the Ruy Lopez and c5 (the Sicilian). Some people say that's complicated but if it's at a level where no-one is memorising lines, then it doesn't make so much difference.

I think you should learn openings as it gives you a plan at the beginning of the game. This is only in the sense of reaching a setup/position that you understand, not memorising long lines.

@1

"What are the best openings for black and white for new players?"
++ For black 1 e4 e5 and 1 d4 d5, for white 1 e4.

"Should I even be concerned with set lines?" ++ No

"Should I prioritize just playing chess placing no importance on specific lines and openings?"
++ Yes. Do follow opening principles however.

"around what elo does a player develop a sufficient understanding of the game to start using specific openings for black and white?" ++ 2500

"tips to improve as a beginner?"
++ Play a slower time control and with increment, preferably 15|10.
Use all the time allowed by the time control.
Always check your intended move is no blunder before you play it.
Whenever you lose a game, analyse it thoroughly to learn from your mistakes.

Just play a lot, open with 1.e4, reply to 1. e4 with 1. ..e5 and to 1.d4 with ..d5.

Follow the rules at Opening Rules

At 1700 ( fide, not chess.com ) you can start looking into creating a repertoire.

To improve your play, get a good entry level collection of annotated games, a tactics workbook and a middlegame book, prefer slower games to blitz.

In my opinion, the "Wayward Queen Attack" for white that can lead to the "Scholar's Mate".

And for black it would be the "Scandinavian Defense".

But, to be honest, just go with what seems the best moves at the moment of the game.