How do I do multiple keybinds?

So I want to make this program but when there are two of them running at the same time, none of them works. Also, if you don't mind, can you explain me how this code works?

function onKeyPress(actionName, userInputState, inputObject)
	if userInputState == Enum.UserInputState.Begin then
		script.Parent.YAAA:FireServer()
	end
end
 
game.ContextActionService:BindAction("keyPress", onKeyPress, false, Enum.KeyCode.R)


function onKeyPress(actionName, userInputState, inputObject)
	if userInputState == Enum.UserInputState.Begin then
		script.Parent.Fire:FireServer()
	end
end
 
game.ContextActionService:BindAction("keyPress", onKeyPress, false, Enum.KeyCode.E)