What is the point of a function? What does it do? Do you need them?

A function is a chunk of code that you encase that will only run when called on. for instace

--this is how you make a function with the name 'printSomeLines'
function printSomeLines()
    print('hello')
    print('World')
end

The code in this function will only run if the function is called upon like so

--since we already created the function above doing this will run all of the code inside of it
printSomeLines()

Alot of events in this game allow you to connect a function to it when they trigger like

--This connected function will run whenever the button is clicked
button.ClickDetector.MouseClick:Connect(printSomeLines)

However, you dont have to create your own function and call it, you can make an anonymous function and put it in the event like so

button.ClickDetector.MouseClick:Connect(function()
    print('Hello')
    print('World')
end)