When defining variables, functions etc, upper case first letter means they are accessible to external namespaces, libraries etc.
Go also has a 'main' function (application starts here).
GO executes applications in the following order:
1. Imports statements
2. Package-level variables/constants declarations
3. init() function
4. main() function (if the project is to be treated as an app)

Example of a namespace declaration = 'package main'.

Prepending '&' symbol allows us to get the memory address (reference) of almost anything.
When we do this we are working with the original data, not a copy of it.