So I looked it up, and saw a bunch of answers . . . which makes me wonder, what the hell is going on!?
The main resolution to this is that there's no magic bullet. Beginners often ask: "how many pages should I read," or "how many puzzles should I solve?" or "how many games should I play?" But these are the wrong questions and they have no correct answer.
The learning process is about:
1) Identifying the main elements that make people good
2) Identifying your weaknesses
3) Working to improve your weak areas
4) Analyzing #3 to see check whether it's working and make adjustments as needed.
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For chess this is:
1) openings, tactics, strategy, endgame (and for anyone under 1600, a thing I call "calculation habits")
2) Usually NOT the opening. Look at your losses, and for each one write down the biggest mistake. After you've done this for 20, 30, 40 games, you'll be able to see your weakest areas... and don't just write down openings or endgames, write down anything... like "I moved too slow/fast" or "I can't defend against knights"
3) For strategy and endgames read books. For openings use databases. For tactics solve puzzles.
For calculation habits play games with a time control that's long enough to allow you to find all of the checks, captures, and threats in the position. Even beginners do this in some positions, but your goal is to do it for 100% of the moves in 100% of your games. It takes a lot of time to build up this habit.
4) A good example of this is re-doing EVERY puzzle you failed yesterday or a few days ago. If you fail one of them again? That's fine. You'll try it a 3rd time tomorrow, and a 4th time the day after that, and on and on until you get it right at least once.
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To answer your question about games, as long as you have something in mind you'll work on (and it can be something simple like "I don't want to miss any knight forks this game") that's fine. Play time controls that are long enough for you to do this.
This is how games help you improve... if you don't play with a purpose it's possible to play and not improve. Some people play 100,000 games without improving. The number of games is completely unimportant.
Whenever I see my own profile and how my ELO fluctuates around 700 I wonder if I don't play enough. Yet when I play more often I also rage more often if I make mistakes and play worse. Yet it also feels like if I don't play for a few days or weeks I become worse for a few games after return.
So I looked it up, and saw a bunch of answers which are confusing me. Some GMs and IMs say you should only play if you are mentally fit, and stop after 2-3 losses. Others say you should play at least 5 games per day (10 min games), others say you should only play one classic game per day. And others that you don't even need to play at all to get better, that tactics and studying is enough.
Which makes me wonder, what the hell is going on!? How many games per week did you play while you made the most progress? And not ELO alone, I also mean by getting better with an opening, or not making a mistake that blundered the whole game anymore. That kind of progress.