Bash scripts. Almost anyone needs to write one sooner or later. Almost no one says “yeah, I love writing them”. And that’s why almost everyone is putting low attention while writing them.
I won’t try to make you a Bash expert (since I’m not a one either), but I will show you a minimal template that will make your scripts safer. You don’t need to thank me, your future self will thank you.
The opposite of "it's like riding a bike" is "it's like programming in bash". A phrase which means that no matter how many times you do something, you will have to re-learn it every single time.
Bash inherited the shell throne and can be found on almost every Linux, including Docker images. And this is the environment in which most of the backend runs. So if you need to script the server application startup, a CI/CD step, or integration test run, Bash is there for you.