For me it's got to be learning some basic command line tools, and how to link them. One commonly used operational tool on my team is a simple chain of command l

For me it's got to be learning some basic command line tools, and how to link them. One commonly used operational tool on my team is a simple chain of command line commands (curl, into jq, back into curl), and it has saved every member of my team countless hours of manually clicking buttons in a third-party web-ui. I threw it together in 5 minutes.