Having a blast with this excellent course! Thank you for creating this section of the forum.
In lesson 1.3.08 “Styling Nodes in the DOM”:
At around timestamp 5:00, “:hover” is described as a pseudo-style. All the documentation I can find describes it as a “pseudo-class” (used to add styles).
In lesson 1.3.08, at around timestamp 22:28, there is a slide where the method “insertRule” is spelled “inserRule”.