Here I leave you more than 85 tips that you should respect in chess

Opening
Control the center: Try to control the central squares (e4, e5, d4, d5) from the beginning.
Develop your pieces: Bring out your knights and bishops before moving your rooks and queen.
Don't move the same piece twice in the opening: Unless necessary, try not to move the same piece twice to avoid wasting time.
Castle early: Protect your king and connect your rooks in castling.
Don't take out your queen too early: Avoid moving your queen early in the game so as not to make her vulnerable to attacks.
Avoid moving too many pawns: Do not move too many pawns in the opening, as this can weaken your position.
Develop with threat: Try to develop your pieces by creating threats to buy time.
Learn about common openings: Familiarize yourself with popular openings such as the Spanish Opening, the Queen's Gambit, and the Sicilian Defense.
Avoid weaknesses: Do not create unnecessary weaknesses, such as isolated pawns or doubles.
Actively develop your pieces: Make sure your pieces have mobility and good squares.
Middle Game
Plan your plays: Always have a plan and try to improve it as the game progresses.
Connect your towers: Bring your towers to open or semi-open columns.
Place your knights in the center: Knights are most effective in the center of the board.
Prevent your opponent from castling: Try to prevent your opponent from castling.
Develop all your pieces: Don't leave pieces undeveloped.
Attack Weaknesses: Identify and attack weaknesses in your opponent's position.
Make waiting moves: Sometimes waiting moves can cause mistakes in your opponent.
Evaluate positions: Learn to evaluate position before making a move.
Protect your king: Make sure your king is safe, especially after castling.
Maintain coordination of your pieces: Make sure your pieces work together effectively.
Tactics
Practice tactical problems: Do tactics exercises regularly.
Focus on weak pawns: Attack isolated and double pawns.
Attack two points at once: Look for opportunities to attack two points at once (fork tactics).
Attack the king: Look for ways to directly attack the enemy king.
Look for combinations: Always look for tactical combinations in each movement.
Use sacrifices when necessary: ​​Learn when and how to sacrifice material to gain advantage.
Watch the intermediate plays: Pay attention to the intermediate plays that can change the dynamics of the game.
Control the key boxes: Identify and control the important boxes in the position.
Calculate variants: Practice calculating long and complex variants.
Learn tactical patterns: Familiarize yourself with tactical patterns such as pins, forks, uncovers and x-rays.
Final
Learn basic endings: Familiarize yourself with pawn, rook, and minor piece endings.
Centralize your king: In endings, the king must be an active piece.
Create passed pawns: Try to create passed pawns and advance them.
Activate your king and your pieces: Make sure your pieces are active and well positioned.
Use opposition: Learn to use opposition in pawn endings.
Stay calm: Don't rush the end, think carefully about each move.
Calculate carefully: Make sure you calculate accurately in the end.
Block enemy passed pawns: Use your pieces to block the opponent's passed pawns.
Conserve material: Don't change parts unnecessarily, especially when you are at a disadvantage.
Avoid perpetual checks: Make sure your opponent cannot perpetually check you.
General strategy
Know your favorite openings: Get familiar with the openings you like the most and play them frequently.
Play long games: Play games with enough time to think (30 minutes or more).
Analyze your games: Review and analyze your games, especially losses.
Play against stronger players: Learn from your mistakes and improve by playing against stronger opponents.
Use chess software: Use chess programs and applications to train.
Study games of grandmasters: Analyze the games of grandmasters and learn from their strategies.
Make a list of common mistakes: Keep a list of common mistakes you make and work on them.
Focus on constant improvement: Seek to constantly improve every aspect of your game.
Manage your time well: Manage your time on the watch well to avoid rushes.
Maintain a positive attitude: Mental attitude is crucial for success in chess.
Exercise and Preparation
Train regularly: Play and study chess constantly.
Read chess books: There are many valuable books that can help you improve.
Watch instructional videos: Chess videos can offer great insight.
Practice with friends: Play friendly games with friends and discuss them later.
Participate in tournaments: Competing in tournaments will give you experience and confidence.
Challenge yourself: Play against chess engines at different difficulty levels.
Maintain a study routine: Create a chess study schedule and follow it.
Practice complex endings: Work on complex endings to improve your understanding.
Study your openings: Take time to understand the ideas behind your favorite openings.
Work on your weaknesses: Identify your weak points and work to improve them.
Mentality and Attitude
Be patient: Patience is key in chess, don't rush.
Maintain concentration: Avoid distractions and maintain concentration during the game.
Don't underestimate your opponent: Always respect your opponent and play your best.
Learn from defeats: Defeats are opportunities to learn and improve.
Develop your intuition: Over time, trust your intuition to make quick plays.
Enjoy the game: Remember that chess is a game and should be enjoyed.
Be flexible: Be willing to change plans if circumstances require it.
Don't be discouraged: If you lose, don't be discouraged; Every game is a learning opportunity.
Have confidence in yourself: Trust your skills and knowledge.
Stay calm under pressure: Learn to stay calm even in difficult situations.
Technique and Tactics
Use pawns to control space: Pawns can restrict the movement of your opponent's pieces.
Look for weak pawns: Identify and attack the opponent's weak pawns.
Make prophylactic moves: Anticipate the opponent's threats and make moves that prevent them.
Deflect opponent's pieces: Deflect opponent's pieces to exploit their weaknesses.
Support your pieces: Always try to make your pieces support each other.
Learn to calculate variants: The ability to calculate long and precise variants is crucial.
Look for double attacks: Double attacks are very effective and can gain material.
Use pawns to open lines: At certain times, sacrificing pawns to open lines can be beneficial.
Maintain the initiative: Try to maintain the initiative and put your opponent on the defensive.
Avoid isolated pawns: Isolated pawns are generally a weakness and should be avoided.
Physical and Mental Preparation
Maintain good physical condition: Chess requires concentration, and being in good physical shape can help.
Sleep well before a game: Adequate rest is crucial for good performance.
Eat properly: Maintain a balanced diet to ensure energy and concentration.
Take regular breaks: During long games, take short breaks to stay focused.
**Practice