How do I study certain variations?

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EnergizedBimetalGear

Does anyone know how I can learn theory for more uncommon openings such as the french defence: Chigorin variation for white? I’ve looked everywhere but I cannot find.

I also play some rare openings such as the Vienna game 3. g3 variation but there are very little books on it and I’m finding it difficult to learn theory. Any suggestions?

ZarufIqbal

There is a whole tab for that in chess.com called "learn". Here is the link if you can't find it https://www.chess.com/lessons