New ask Hacker News story: Ask HN: (Self) Publishers: How do you research topics?

Ask HN: (Self) Publishers: How do you research topics?
4 by sebst | 0 comments on Hacker News.
As a developer one should be trained to learn and teach at a very high pace. If you want to publish a book, it should of course be related to your area of expertise. However, this can still be very broad. How do you manage your market research when creating a book - or other forms of teaching content?