Control the center
Develop your pieces quickly
Castle early
Avoid moving the same piece repeatedly in the opening
Do not bring your queen out too early
Connect your rooks
Make every move with a purpose
Look for checks, captures, and threats
Protect your king
Improve your worst-placed piece
Trade pieces when ahead
Avoid unnecessary trades when behind
Create and attack weaknesses
Keep your pieces active
Coordinate your pieces
Watch for tactical motifs
Forks
Pins
Skewers
Discovered attacks
Double attacks
Learn basic endgames
Promote pawns safely
Convert advantages patiently
Manage your time well
Think before every move
Review your games
Learn from mistakes
Study openings you understand
Practice regularly
Play with a plan
Stay calm under pressure