Found in 2 comments on Hacker News
WarmlySmoggy · 2019-02-27 · Original thread

This is targeted at the beginner. Maybe someone else can comment on how good it is. Doesn't look to be interactive, but more pictorial based.

abecedarius · 2019-01-21 · Original thread
Just one suggestion, but is a great place to start. Visual Group Theory sounds appropriate too:

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