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You can prefer to
lichess.org/video?tags=opening for openings , which are free for everyone!
Lichess' opening explorer is an excellent way to build your opening repertoire. If you feel like you need more explanation, you can find videos about openings on YouTube and/or Short & Sweet (Free) courses on Chessable.
<Comment deleted by user>
#4 The original poster wants the content to be free to use.
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