My process for any book I'm thinking about writing is:
- write out 10 titles for blog posts on the topic
- write 1-2 blog posts (this lets you see if you have interest/expertise)
- do a bit of research to see if someone else has written on the topic (some googling or reddit searching
- write the rest of the blog posts
If you can't write 10 blog posts about a topic, then you don't have either:
- the interest in the topic
- the knowledge in the topic
If no one else has written anything about the topic, it might not be worth writing about, but you also want to make sure your take is unique enough to be worth your effort.
