Linux Commands
Linux is an open source operating system that is used by almost all developers. Specifically, since it is open source, it provides security, stability, and most importantly, it’s free. If you have macOS, it is heavily based on the same framework Linux has and is practically the same.
A part of using Linux is the need to be familiar with terminal commands, which are the primary way you will interact with your system. Changing directories, making files, copying files, moving files, and running files are just the surface of what you can do with Linux commands, and you will almost certainly use them later in life.
A cheat sheet that may be helpful for quick reference can be found here.
Otherwise, a full lecture on Linux commands by Joe Devietti can be found on Google Drive.