The command line (or Terminal for you Mac fans) is a throwback to a simpler age of computing, before mouse pointers and application windows and desktop wallpaper. Back when it was just you and a window full of text. Operating systems have long since evolved beyond the humble command line interface, but there's still no better tool for quickly disseminating complex information in your operating system -- and you can actually do some other pretty cool stuff with them, too.
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While the Raspberry Pi's operating system is Linux, that doesn't necessarily mean you should go out and memorise every Linux command. The Pi is a different type of computer that's used for different kinds of projects, so the most useful commands differ from what you'd use on an everyday Linux machine. Over at Circuit Basics, they tallied up their 42 most used commands.
Mac: If you tend to run the same Terminal command pretty often, then it makes sense to do one of two things: Create a text expander snippet or turn it into a keyboard shortcut. How-To Geek shows you how to do the latter using Apple's built-in Automator tool.
Typically, if you wanted to control your Raspberry Pi from outside your network, you'd need to go through and set up your router to allow access from the internet, install some software on your Pi, set up a DNS server, and cross your fingers you're doing that all securely. Dataplicity makes this a heck of a lot easier.
iOS: A terminal emulator on your iPhone might sound a little silly for most of us, but SSH can come in pretty handy sometimes. For a while, one the best apps for doing so was Panic's Prompt 2, but Blink Shell is an option that's worth a look too.
Mac: You have a ton of excellent Terminal emulators on Mac, but if you're looking for something that works a little differently than the rest, HyperTerm is worth a look.
Mac: It's easy enough to use a system service to launch Terminal from any folder in OS X, but you don't have much in the way of options. TermHere does the same thing, but allows you to pick your Terminal app of choice, and even open multiple directories.