Ask HN: As a developer, what is cyber security?

I have been writing code and made products for a couple of centuries now. I am by no means a security guy and consider myself a novice in things that lie outside of the best practices, e.g: cross-site attacks, TLS everywhere, no password in configs, no clear text creds etc. But what am I missing ? What are the top 10 things you do when you want to feel safe, when developing products and code. Do you lock the server into a vault and disconnect it from the power? Please share Every time I see