I've often complained that interface design lacks great textbooks—still mostly taught through apprenticeship and trial/error. https://www.interfacecraft.dev is shaping up to be a great resource, particularly for polish and craft.

The step-by-step UI crit/redesigns are a really nice format. Interesting to imagine structuring material like that as Figma artboard sequences, so the student could try each step themselves before revealing the author's take (in the style of https://andymatuschak.org/doing-centric/)