I mean in terms of safety and redundancy (for example not dependant in changes in the google algorithm or CPA terms) I doesnt need to be fast cash. My call is ousourcing/ghost writing books/ebooks and publishing them. It stays forever. The topics must be timeless, so that you can earn forever. For example self-help books, workout books etc. please elaborate, thanks and repo for all good answers. Just need pointers guys to do more stuff with my time.