What I'm missing (couldn't find it on the first glance) is a topic about the performance implications of animations. Most devs don't consider which css properties trigger a layout->paint->composite re-render, which has massive influence on browser performance.
There are soooo many shitty animations/transitions in the web, just because people don't know that animations can slow down a whole site.
Imho people should read something like the web dev one pager on animation performance (1), which explains (more or less) how to build high-performance animations.
There is also this free udacity course (2) which explains everything a web developer needs to know. It's not hard nor magic, and you just have to hear it once to remember it for whenever it becomes necessary.
1: https://developers.google.com/web/fundamentals/design-and-ux... 2: https://eu.udacity.com/course/browser-rendering-optimization...