A hundred things I learned writing my first technical book “Data-Oriented Programming” | Yehonathan Sharvit:

Usually readers stop reading after reading the middle of the book. If you want them to read the second half of your book, you need to find a way to hook them.
A possible way to hook your readers is to tell a story.
Inspiration is not linear. It’s OK to stop writing for a couple of hours.
Motivation is not linear. It’s OK to stop writing for a couple of weeks.