Things they never teach you
Writing advice books tend to go into great detail on things like how to structure your plot, or develop character, or describe things, or whatever.
They do not — in my limited experience; hence this post — bother to say much about how to decide where to break chapters, scenes, or paragraphs, apart from telling you to start a new paragraph if you’re switching speakers in dialogue. Maybe a vague nod at “cliffhangers are exciting!,” but that’s about it. You’re just supposed to figure that stuff out as you go, apparently. Or else (and this is entirely possible) it never occurred to the writer of the writing advice book that there’s an actual skill buried in there.
But I haven’t read a huge number of writing advice books, so I’m perfectly willing to believe that someone out there has at some point unpacked this stuff for the reader. Any recs? Because it’s one of those things that I do instinctively, without much ability to articulate how the decision-making process goes — and since I enjoy teaching writing, being able to articulate it would be useful.