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I’m slightly surprised to see no-one has linked this yet: https://pomax.github.io/bezierinfo/

Another incredibly good and interactive exposition on Beziers

His blogs always hit the top of the front page for good reasons.

He also has an older article on the same topic: https://ciechanow.ski/drawing-bezier-curves/.

Wow what a treat. Thanks for sharing this link. Outstanding.

I discovered this primer a few years back (I'm pretty sure it was here on HN) and it was an excellent read!