Play on lichess.org, it's generally a nicer place than chess[.]com

(Maybe controversial but it's my opinion) De-prioritize learning openings at first. Maybe learn them later in more detail when you want to optimize details. As White, just learn your favorite opening and play that - you'll always be first anyway, so your opponent has to react to your opening. As Black, just learn how to counter the most popular White openings (which is also why most Black openings are called "xyz Defense", because they're reacting to what White does). There are also a few Black openings that can be played against anything White does, so maybe prioritize these so you have to think less about the opening (e.g. King's Indian Defense, Modern Defense). That's about it for starting out. Mid-game and end-game, positioning, tactics, converting winning positions into victories matters FAR more and you will make the most mistakes during mid- and end-game anyway. There is a lot of openings content on Youtube for example, which might suggest that openings are super important. But really, they're just easy-to-produce low-effort content for chess masters.

Watch videos of master-level games with good commentaries, explaining each move. Try to understand the reasoning behind the moves. Why a move is good or bad.

Play a lot of Rapid. I'd recommend Rapid because it's not as slow as Classical, so you can play tons of games (playing a lot is important for experience), but still not as ludicrously fast as Bullet or Blitz. I don't like the too fast time controls because this really just causes players of any skill level to make blunders they otherwise wouldn't have done.

After each game, do a computer analysis and see where your mistakes were (also if you've won!). This is also very important because otherwise you sometimes can't know where you made a mistake or where you played sub-optimally.