Which is the best website to learn chess openings for free ?

Based on the search results provided, here are some of the best websites to learn chess openings for free:

Lichess.org - This is a completely free website that has a good player pool and great software 1. Many users from the search results suggested this is a great platform for learning chess.
Chess.com - Chess.com has a free live server where you can play 3000 games of chess, as well as a collection of free chess lessons that are a great starting point for learning chess.
3 2. ChessTempo - Chesstempo is mentioned as a good place to do quizzes and ignite opening practice.

MoveTrainer - MoveTrainer offers a selection of free opening repertoires as well as their top-rated premium courses to improve your chess openings.
5 3. ChessMood - If you want a step-by-step analysis of chess openings and games, with quick tactics and strategies, ChessMood is an excellent website to go.

Overall, Lichess.org and Chess.com seem to be the most recommended websites from the search results for learning chess openings for free.

you could also use youtube (ikik not a chess website) but u could still learn openings there

I would recommend openings101

try chessme.io

I think chess.com and lichess.org are the best chess learning websites.

Have you tried www.AiChessCoach.net?
I found this on another site. Works quite well for me.

You can also check out chessable. It has a lot of good repertoires.

There is free stuff on chessable

I think the best are aimchess, chessmood & chessable but they all cost money. Eric Rosen is giving out 1 month of free chessmood though

Chess Openings Resources for Beginners and Beyond…

https://www.chess.com/blog/RussBell/openings-resources-for-beginners-and-beyond