Openings

ECO Codes at 365Chess.com
ECO (Encyclopedia of Chess Openngs)
https://www.365chess.com/eco.php

How to Study Openings

How To Learn & Study Chess Openings – YouTube: https://www.youtube.com/watch?v=6IegDENuxU4

Best Openings to Play

Chess Openings TIER LIST Against 1.D4 | GM Moulthun Ly – YouTube:
https://www.youtube.com/watch?v=R02BxJqi7Vw

Sicilian Defense

Sicilian Defences TIER LIST | Pros And Cons Of Each One | GM Molton – YouTube:
https://www.youtube.com/watch?v=vSIXbs9Esuc

Anish Giri teaches the Sicilian Najdorf – YouTube: https://www.youtube.com/watch?v=ucaCZSCRTxU

Smith Morra Gambit Fans 8. Nd5 |
You Must Try This New Knight Sacrifice Variation – YouTube:

https://www.youtube.com/watch?v=vYmLitaZwjY

Modern Defense

The Modern Defense | Play the modern by Shirov with …c6 – YouTube:
https://www.youtube.com/watch?v=0jKPEcesb6k