Optionally installing Yarn

Yarn is a package management tool similar to and compatible with npm, though I find it is faster and easier to work with. If using Homebrew on macOS, you may simply install it using brew install yarn; otherwise follow the instructions found on Yarn's installation guide page (https://yarnpkg.com/en/docs/install#windows-stable).

If you want to use npm instead of Yarn, you may; both respect the same format for package.json, though they have slightly different syntaxes for commands such as add, require, and install. If you're using npm instead of Yarn, simply replace the commands with the correct function; the package names used will all be the same.