things i should focus on right now as a 750.

so currently I am working on learning openings, calculations/tactics, middle games and endgames. I’m asking for help to know if there are other things i should focus on and where I should try to improve them, I currently use Lichess for learning and analyzing my games. If there is anything you want to say please tell as I would very much appreciate it.

Learning openings is generally a waste of time on that level, if by learning openings you mean memorizing lines. On that level, people will rarely play main lines anyway. You should stick to opening principles, learn the first 3-4 moves of the variation you wish to play and just play them. After the game, it is fine to see where you deviated from the opening and whatnot, but don't waste your time memorizing stuff.

Second, 10 minute per side games might be a bit fast for you. You need to think on your moves. You generally have 2 main goals for now: fillowing opening principles and avoiding strait up blunders like giving away your pieces for free. It is most likely better to play 15|10 games, or even longer if you wish. You don't need to play too many per day. You can even play 1 per day or even less than that, but spend some time analyzing it to the best of your ability afterwards.

So quality of your games beats quantity for learning purposes.

I've written a guide of sorts for questions like these, where I've explained it in more detail. Here you go:

https://www.chess.com/blog/nklristic/the-beginners-tale-first-steps-to-chess-improvement

In any case, good luck.

Memorise the first three or four lines of an opening like queens gambit umm d4 d5 c4 dxc4 e4 but if declined then I don’t know

what is the cinnamon toast crunch

 

best advice i've seen in my life

d4 nf6 c4 e6 nc3 bb4 e3 etc.

All these things are nice, but honestly a bit much. Around this level, I'd personally place more emphasis on basic checkmates (like Rook + King vs King) and basic theoretical endgames (like King + pawn vs King when winning and when drawn). As for openings, I'd mostly stick with opening "principles" and less about specific variations: 

https://www.chess.com/blog/KeSetoKaiba/opening-principles-again 

Solving chess puzzles (tactics puzzles) is also extremely beneficial, but I'd prefer quality over quantity on those. I used to only do a few chess puzzles a day (5-10 maybe) and that was enough for me back then. 

Doing these things and some other things might get you over 1000+ chess.com rating with some practice (perhaps a month or so?). Good luck with your chess journey

First priority sub-800 is to play and review enough slow games (Ideally 15+10 or more) until you stop giving your opponent's free pieces/pawns, and spot all opportunities to take free pieces/pawns.

After that, you should learn the basic tactical patterns, study some chess puzzles, and go back to playing slow games until you can consistently recognize these 2 or so move combinations.

I'd say that's enough to get to 1000, at which point you can start to focus on positional play and other stuff

You need to turn into the hulk suddenly calculating at over 2400.

Until you are a master, your opening repertoire is tactics, your middlegame strategy is tactics, and your endgame technique is tactics.

-(famous quote from the late FM Ken Smith, modified slightly by dannyhume)

Know some basic openings, do tactic puzzles, watch some higher rated games.

Chess is 99% tactics. If you want to become stronger, tactics are the way. The only way. Look at your games and see how many of them were decided by someone winning or losing a piece. That is the one thing you need to fix and keep fixing for a long time to come to get better.

After looking over your games, it's obvious that what you need most to work on is observation to avoid gross blunders.  I would suggest longer time control but if you insist on playing 15/0, worry less about losing on time and more about not giving away your Queen. 

Batgirl has nailed it in #13! The most important thing you can do to advance from the beginner stage is to learn to look at the board! Quit blundering your pieces to your opponent, and start picking up the loose pieces that he leaves hanging

i dont even know how i managed to blunder queens in 2 rounds

for starters, use your clock

it is not a race to see who can end up with more time on the clock than what was started with

spending more time on the position; especially after a player makes a move will help you navigate from the first move to the last in your post game analysis/review (which you have to do and is critical if you want to improve)

if you arent sure how you lost your queens start from the beginning of the game and thoroughly go over each move: why did you make each move? what were your plans? what do you think your opponents plans were? etc.

i find 15/10 very quick but in your case i think you could make immediate strides if you take your time with each move

dont mindlessly respond with a blitzed out move

if you can get develop with some central presence, good minor piece placement, a safe king, and plans for placement of your heavies then, honestly, the game was successful

try to get out of the opening phase with these accomplished (central presence, minor piece development and safe king)

are your central pawns protected?
is the only protection a knight that can be easily pinned? and are there ways to address this?

where should the bishops go?
when will i castle?

if you can give some answers (even if these answers are “wrong”) to these then you are making progress


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use your clock and think about each move

Which is why that needs to be the first thing you address.  

Take your time! Look at the board. Don't make empty one-move threats. But above all, look at the board!

 

 

i never want to see that game as long as i live man i m dying from cringe.

Embrace that game! learn from it. Six months from now you can use it as a benchmark to show how much stronger you've become