I make a few hundred per year from my e-book, which took about half a year of on and off work to finish and is now partially out of date (tip: don’t write books

I make a few hundred per year from my e-book, which took about half a year of on and off work to finish and is now partially out of date (tip: don’t write books about front end software development). My current side project is more ambitious and has a lot of potential but it’s probably not going to work as passive income...