Packages are a level above functions in Go.
The main package represents an executable, and any other package is known as a library package, which can not have a main function. These library packages help split up code into more manageable pieces.
Packages can span multiple files, and the file names do not matter.
Declare the package with package <name>.
Import with import <optional alias> <package name>
If a package requires initialisation, the init function can be used.
Private vs public functions: [[20200720101212-go-private]]