I ran a newsletter for https://maxrozen.com https://maxrozen.com in the lead up to releasing a book on React's useEffect hook, for about a year. It was no extr

I ran a newsletter for https://maxrozen.com https://maxrozen.com in the lead up to releasing a book on React's useEffect hook, for about a year. It was no extra work, since I was writing articles anyway, so this gave me another channel to let folks know a new article was out. When I eventually released the book, email subscribers were 5x as likely to buy the book than people coming in via Google search. Effectively, it's about building an audience to sell to, and it works.