How to get better in chess for 1100-1300 player?

1) Learn opening/ understand opening principles and try something new each game?

2) Day chess/ quick games?

3) Also, how to send games for better players so they can point out tactics mistakes if no blunders are made?

4) Still do not understand some exchange situations. Could smn explain me when they benefit you and when they are not.

Interested to get better long term in chess and practice at least 30 mins each day.  

Opening Principles:

1. Control the center squares – d4-e4-d5-e5.
2. Develop your minor pieces toward the center – piece activity is the key. Centralized piece control more squares.
3. (King Safety)
4. Connect your rooks. There should be no pieces between your Rooks.

The objective of development is about improving the value of your pieces by increasing the importance of their roles (Piece Activity).  Well-developed pieces have more fire-power than undeveloped pieces and they do more in helping you gain control.

Now we will look at 5 practical things you can do to help you achieve your development objective.

They are:

1. Give priority to your least active pieces.

• Which piece needs to be developed (which piece is the least active)?
• Where should it go (where can its role be maximized)?

1. Exchange your least active pieces for your opponent’s active pieces.
2. Restrict the development of your opponent’s pieces.
3. Neutralize your opponent’s best piece.
4. Secure strong squares for your pieces.

Don’t help your opponent develop.

There are 2 common mistakes whereby you will simply be helping your opponent to develop:

1. Making a weak threat that can easily be blocked
2. Making an exchange that helps your opponent to develop a piece

Pre Move Checklist:

1. Make sure all your pieces are safe.
2. Look for forcing move: Checks, captures, threats. You want to look at ALL forcing moves (even the bad ones) this will force you look at, and see the entire board.
3. If there are no forcing moves, you then want to remove any of your opponent’s pieces from your side of the board.
4. If your opponent doesn’t have any of his pieces on your side of the board, then you want to improve the position of your least active piece.
5. After each move by your opponent, ask yourself: "What is my opponent trying to do?"

General Ideas.

1. Stop playing blitz, and bullet.  Play longer time controls of at least G45, or longer.  
2. Follow Opening Principles:

• Control the center.
• Develop minor pieces toward the center.
• Castle.
• Connect your rooks.

1. Study tactics...tactics...tactics.  One of my favorite quotes is this: "Until you reach Master, your first name is tactics, your middle name is tactics, and your last name is tactics”.
2. Double Check your moves.  Before making a move, ask yourself: "Are my pieces safe?"
3. After your opponent moves, ask yourself: "What is my opponent trying to do?"
4. Analyze your games WITHOUT a chess engine, then have someone stronger go over the games, or post them online for review.
5. DO NOT memorize openings. Learn and understand the pawn structure, and piece placement for the opening you wish to learn.
6. Learn Basics Mates:

• K vs. KQ
• K vs. KR
• K vs. KRR

1. Learn Basic King and Pawn endings.

• KP vs. K
• Opposition

1. Have Fun!

You could just watch some youtube videos about the openings and gambits you want to learn about. Watch puzzle videos to learn about what you can do in each position. This channel has some good gambits: https://www.youtube.com/channel/UCLXYjOKeyT-KCwK09Bvvxwg/featured?view_as=subscriber

Lots of resources for chess improvement here....including opening principles....check it out...

https://www.chess.com/blog/RussBell

Play Longer Time Controls...

For many at the beginner-novice level, speed chess tends to be primarily an exercise in moving pieces around faster than your opponent while avoiding checkmate, in hopes that his/her clock runs out sooner than yours.  Or being fortunate enough to be able to exploit your opponent’s blunders before they exploit yours.

There is little time to think about what you should be doing.

It makes sense that taking more time to think about what you should be doing would promote improvement in your chess skills.

An effective way to improve your chess is therefore to play mostly longer time controls, including "daily" chess, so you have time to think about what you should be doing.

This is not to suggest that you should necessarily play exclusively slow time controls or daily games, but they should be a significant percentage of your games, at least as much, if not more so than speed games which do almost nothing to promote an understanding of how to play the game well.

Here's what IM Jeremy Silman, well-known chess book author, has to say on the topic...
https://www.chess.com/article/view/longer-time-controls-are-more-instructive

And Dan Heisman, well-known chess teacher and chess book author…
https://web.archive.org/web/20140627052239/http:/www.chesscafe.com/text/heisman16.pdf

https://www.chess.com/blog/RussBell/dan-heisman-resources

and the experience of a FIDE Master...
https://www.chess.com/forum/view/general/how-blitz-and-bullet-rotted-my-brain-don-t-let-it-rot-yours

One way to increas your rating and possibly your playing strength, if youve the head for it.

Look at what the other club players are doing in tournements. See what games they are playing . Get a chess informant (do they still make these?)

anyways memorize several of the newest developments in the most popular  games that you observed enter the tourney and see how you do. You can usually get an idea where youll be placed in a tournement based on rating and who you'll play. especially if its a small club.

Me, who plays kings Indian

Simply read recently published book and clear all your doubts in one stop -

"Must Know Chess Concepts To Become A Strong Player" available in amazon.

I have increased 120+ eo rating withing 2 months .. Try it out, its an eye opener believe me.