Ask HN: Any “Udemy for Advanced Programmers”?

There’s quite easy to go from 0 to 1 these days.

But how to learn production grade best practices, new approaches etc. for already experienced developers?

There’s not always a brilliant colleague at hand or perfect examples to learn from inside your own work.

But you still want to learn new stuff and all the HOWs and WHYs of production, not toy/student projects.

I wonder if there's any “udemy for hackers/software engineers”?