Ask 100 people, you'll get 100 opinions, but ok, here's mine
At what point is it necessary to learn openings?
To improve efficiently it's best to not have any area be much weaker than the others (opening, tactics, strategy, endgame).
Opening study is a common pitfall for new players. They spend a lot of time with openings and it doesn't improve their results. Because of this the typical advice is to "ignore" openings, but that's not quite right. Learning a few moves of the main lines you play is useful. Learning a main idea of a typical opening position is useful. Reviewing your games against an opening database is useful. Looking at GM games in openings you're interested in (at the rate of 5-10 minutes per game, 1 or 2 games a day) is useful.
In contrast, getting a book or online opening repertoire thing, and memorizing dozens of lines, 10+ moves deep, is a complete waste of time for new players.
Mostly I just try to develop pieces and control the center without a specific plan - is this OK?
Yes.
For reference, the (extremely simplified) flow of a game goes development -> pawn break -> infiltration -> win material / checkmate.
Forming a reasonable plan in an unfamiliar position isn't possible until you've played and studied quite a bit... as in years. Mostly what you'll want to do is learn fundamental ideas for a given opening or pawn structure. Then when faced with an unknown position, you'll use your general knowledge as a sort of scaffolding to build your plan e.g. "this is like a Sicilian except X is different, so I'll use the typical plan but modified to account for X." But yeah, getting to this point takes a long time. Until then some positions will simply be a mystery to you. In that case do your best to quickly finish opening development and not give away pieces for free and you'll be doing fine most of the time.
What are the endgames I should know? I currently know K+Q, K+R and R+R. What are the most common, and where's the best place to learn them?
That's a good start. After that I'd say it's most useful to learn the principles behind winning a few basic king and pawn endgames. The basic plan to win the position below is must know material.
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The idea of decoying defenders to gain an advantage in another area is found in multiple ways and in all sorts of positions. Just something to keep in mind. Also google "square of the pawn"
I don't know the best place to learn basic endgames. I'd say a book, but people like online stuff these days.
What is a good Elo goal to aim for if I'm playing and doing tactics for 1/2 - 1 hour per day?
Rating depends on both the website and time control. 1200 lichess is not 1200 chess.com. 1200 rapid is not 1200 blitz, etc.
I'd say... aim for 200 points more than whatever your rating is after your first 100 games. That's not easy, but it's certainly an achievable goal. If you still like chess after that you can set another goal.
As for a more advanced goal, I'd make it more performance oriented and say get to a level where you're almost never giving away pieces or pawns for free, and you're almost always taking your opponent's pieces or pawns for free when a blunder gives you the opportunity. Even a beginner can avoid giving away pieces on some moves, but it typically takes people a lot of practice (sometimes years) before it's nearly 100% of moves in 100% of games (both punishing your opponent's simple blunders and avoiding making your own). Be sure the time controls you play are long enough that you can start forming these good calculation habits
Hi. I've been playing chess for a week or two (~1200 on lichess.com) and I have a few questions not answered in the (great) FAQ.
At what point is it necessary to learn openings? Mos https://19216801.onl/ tly I just try to develop pieces and control the center without a specific plan - is this OK?
What are the endgames I should know? I currently know K+Q, K+R and R+R. What are the most common, and where's the best pla ce to learn them?
What is a good Elo goal to aim for if I'm playing and doing tactics for 1/2 - 1 hour per day?
Thanks.