This is a good list (except for 11, survivorship bias means that investing in startups is not as universally profitable as investing in VTI). All of these though have been covered extensively in lots of books over the years that I'd assume even a cursory search of "how to get started with entrepreneurship and startups" would uncover, like Lean Startup, Mom Test, etc, for those who don't want to learn the hard way as it seems you have.