Well, there is at least another source with better visualizations AND explanations of bezier curves. So I'm not impressed at all.

The ultimate guide for bezier curves including great animations to explain the concept is from pomax:

http://pomax.github.io/bezierinfo/

I would go as far as to call it a bezier reference document. I learned both geomteric and numerical approaches to calculate, combine and draw bezier curves from this source. I am still amazed by the beauty of de Casteljau's algorithm.

The document has been submitted here before:

https://news.ycombinator.com/item?id=8804691

https://news.ycombinator.com/item?id=5714842

https://news.ycombinator.com/item?id=7997706

For anyone with enough formal mathematics background to follow the argument, Lyle Ramshaw’s monograph, On multiplying points: the paired algebras of forms and sites, supplies the clearest formalism for understanding and working with Bézier curves and various CAGD surface primitives. http://www.hpl.hp.com/techreports/Compaq-DEC/SRC-RR-169.html (Note: ~150 page math book, takes some work to follow.)

Also check out the pomax bezier curve primer, which is filled with interactive diagrams and nice explanations of algorithms for doing anything you might like with Bézier curves, http://pomax.github.io/bezierinfo/ (previous discussions, https://news.ycombinator.com/item?id=11402656 https://news.ycombinator.com/item?id=8804691)

Thanks again to Pomax for one of my favorite references on Béziers.

This has been posted to HN 19+ times, here are some of the more useful threads:

https://news.ycombinator.com/item?id=14191577

https://news.ycombinator.com/item?id=20751074

https://news.ycombinator.com/item?id=11402656

https://news.ycombinator.com/item?id=12503851

https://news.ycombinator.com/item?id=8804691

https://news.ycombinator.com/item?id=30100427

https://news.ycombinator.com/item?id=28686939

https://news.ycombinator.com/item?id=17803451