I've been going through bookshelves in thrift stores for years and purchased every book I've seen about writing fiction, but only in the last few months have I collected them all and read through many of them. One is Koontz' "How To Write Best Selling Fiction" from circa 1980. I think I got a lot more out of it than the King book. Looks like the going price for copies of this jewel is around $75, and it just might be worth it. Here's a couple dollars' worth of what I learned from it.
Koontz says to continually "put the screws" (my term, not his that I remember) to the MC/protagonist, more and more as the story goes on. Make every scene give him a worse time, and make his goals harder to achieve than they were at the end of the previous scene. I attempted to follow this advice in my FF piece "The Photograph" that ended up with the wife going over the top.
Flapdoodle said:
The best way to learn is to read. You have to dissect a story, see how it goes together, and then try to mimic. Once you've mimiced, you'll find your own voice. There's no silver bullet, and I suspect most writers don't really understand in technical, theoretical terms, what they are doing - mostly instinct and learning.
Koontz says "Read, read, read" (and admittedly he means fiction (not how-to-write books!), mostly in the genre you want to write) and "Write, write, write" several times in the book. He says to read a novel twice, first for pleasure and second to analyze it, to see how the author did the things that got you interested, manipulated your emotions, etc.
I feel like I've got a lot of catching up to do. I haven't read a lot other than SF, and I did most of my reading over 25 years ago.