I'd like to make a couple of suggestions for the Themers' Guide.
(a) show the results of the 4Numbers settings on the Cheat Sheet (page 45); as in (I hope I've got this right):
Big pic:
https://i.imgur.com/bqfszEE.png
(b) Pink lines (page 41): one of the mistakes I make, resulting in pink lines being visible, is altering the hue, saturation or luminosity of the whole image and forgetting to recolour the pink lines. That would be worth mentioning.
(c) produce the Guide in a single-page format; that is, one half of each current page at a time - that way the Guide will be in portrait layout and users will be able to read a page AND see the text file they are editing at the same time.
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WT, I was going to send a PM but your message store is full.