I saw this really cool, interactive, single-serving site that explains with a tap the various parts of typographic anatomy. Ligatures! Bowls! Serifs! Crotch! Crotch? Crotch.
This is incredibly helpful to me as someone who loves hand lettering/calligraphy and typography in general, because, cards-on-the-table time, I never remember what these pieces and parts are called, ever. I’m going to bookmark this and try to retain some of the information as I keep practicing my lettering.