What are aspects
What are the most important aspects to learn in chess?

Vision? In chess you need to be able to see patterns. Sometimes you might see more than one pattern, and each might indicate a path that is more or less profitable to follow. Sometimes, if your chess vision is working well, you get the feeling that you are actually seeing into the future. I have had that feeling only once or twice in the 55 or so years I have been playing chess. I'm sure players like Tal or So or Larsen have it much more often than that. :)

It depends on everyone's personality, but I would say reading commented games and practicing tactical position. Especialy players before computer chess era (Euwe, Nimzovitch, Pachman...).
I would advise NOT binge playing hundreeds of games a day without even analysing post-playing . When I stopped playing 20 years ago, I played only on Saturdays or during tournaments, otherwise I read books and loved it the sae way someone who loves football would enjoy watching a game on tv, and my level was much higher than now, after one year I started back playing for fun, but only bulleting.

Get a good coach.
I don't use coaches lmao
Obviously.

Chess is a great game, which starts simple at first, but there is a deeper meaning. There are many things to learn if you want chess to be a long-term thing, but what are the most important aspects to learn? This is because I don't want to learn something like Alekhine's gun (which won't happen in most of anybody's games) for it to be never used in an actual game.
Dear Spacecatchess2007,
My name is Gabor Balazs. I’m a Hungarian FIDE Master and a certified, full-time chess coach, so I hope I can help you. Everybody is different, so that's why there isn't only one given way to learn and improve.
First of all, you have to discover your biggest weaknesses in the game and start working on them. The most effective way for that is analyzing your own games. There is a built-in engine on chess.com which can show you if a move is good or bad but the only problem is that it can't explain to you the plans, ideas behind the moves, so you won't know why it is so good or bad.
In my opinion, chess has 4 main territories (openings, strategies, tactics/combinations and endgames) and if you want to improve efficiently, you should improve all of these skills almost at the same time. That's what my training program is based on. My students enjoy the lessons because they cover multiple aspects of chess in an engaging and dynamic way, keeping the learning process both stimulating and efficient. Of course, there are always ups and downs but this is completely normal in everyone's career.
If you would like to learn more about chess, you can take private lessons from me (you find the details on my profile) or you can visit my Patreon channel (www.patreon.com/Bgabor91), where you can learn about every kind of topics (openings, strategies, tactics, endgames, game analysis). There are more than 25 hours of educational videos uploaded already and I'm planning to upload at least 4 new videos per week, so you can get 4-6 hours of educational contents every month. I also upload daily puzzles in 4 levels every day which are available with a FREE subscription.
I hope this is helpful for you. Good luck with your games!
Chess is a great game, which starts simple at first, but there is a deeper meaning. There are many things to learn if you want chess to be a long-term thing, but what are the most important aspects to learn? This is because I don't want to learn something like Alekhine's gun (which won't happen in most of anybody's games) for it to be never used in an actual game.