surprisingly, one of the BEST books on writing i've read is anything by R.A.Paterson, but especially his "How to write manga". I mean, he also has books on lightnovels and movies, tho it's more or less same things just repackaged.
but he is great at relaying the point simply and in an engaging matter, so i recc it to anyone!
(i'll check how to pirate kindle books so i can post what i have here lol. Feel free to share links on books you got and i'll put them in the first post!)