Ask HN: What you need to know to become a CTO?

Of course, there is nothing more valuable than real experience, but there is a ton of useful resources over the internet to help to become a CTO. Let's create together an amazing list of resources (blog posts, books, presentations, videos etc.) to help others to become a CTO/Technical Leader in a startup/company.

Please add your resources in comments or directly in google sheet ---> https://docs.google.com/spreadsheets/d/17eBWH-n4-Ap8_S59gpTK...