chessdb

Chess - Play and Learn - Apps on Google Play

Quantifying human performance in chess

Lichess Study: The Only Guide You'll Ever Need - The School Of Rook

Chess Games.com

shafen's Blog • The Lichess Opening Explorer: A Powerful Tool to Master Chess Openings •

London System Opening Complete Guide

Chess Opening Database - Shredder Chess

Chess Openings: To Memorize or Not to Memorize, That is the Question

Why is the Anderssen Opening (1. a3) a bad opening? It is the same as playing for black, but without having to worry about any pieces on b4. - Quora

Opening repertoire study with spaced repetition (+ database and game collections) : r/chess