Ask HN: What should I learn to make my full stack deployment easier?

I consider myself to be a novice full-stacker, with a preference for python. However, there's a lot of tools out there for many different purposes. I just wanted recommendation on what to learn/use to make my life easier. So... What is it that you guys use that can make my life a little easier? Don't be afraid to get specific (ex. docker, ansible.. etc)