The most natural way is to join a startup that is scaling. You can of course learn by doing it yourself on the side, but in practice "learning by doing" on the job is by far the most effective in my experience.

I also hope we don't need to know all this stuff in the future. It's pretty really low-level and it's much better if we can focus more on creating differentiation and building your actual product. (Full disclosure: I've founded a startup that's trying to do exactly that, so I guess I'm biased!)