1. We'll use the Linux operating system, via the Raspbian distribution, and leverage it to run our projects in Node.js.
2. GPIO stands for General-Purpose Input/Output.
3. Rick Waldron started the Johnny-Five project back in 2012 and wrote a program that used node-serialport to operate an Arduino Uno with Node.js.
4. We run uname -m command on the command line of our Pi ssh session to find out what ARM architecture the Raspberry Pi uses.
5. Changing the default Raspberry Pi password is important because default username and password isn't very secure, especially when your Pi is connected to the internet.
6. Node.js allows you to create even advanced robotics projects without having to deal with any low-level languages, also it has Event-based systems and Garbage collection/automatic memory management.
7. Node.js prides itself on creating small, bordering on tiny, packages, and has the excellent npm package manager (and others) to help manage those packages.