This is the MIT “The Missing Semester of Your CS Education” from their website: https://missing.csail.mit.edu/ .
Classes teach you all about advanced topics within CS, from operating systems to machine learning. There’s one critical subject that’s rarely covered; instead left to students to figure out on their own: proficiency with their tools.
We’ll teach you how to master the command-line. How to use a powerful text editor. Use fancy features of version control systems, and much more!
Students spend hundreds of hours using these tools over the course of their education (and thousands over their career). It makes sense to make the experience as fluid and friction-less as possible.
Mastering these tools not only enables you to spend less time on figuring out how to bend your tools to your will, but it also lets you solve problems that would previously seem impossibly complex.