Few more questions?

What is return and how often do we use it in roblox?( please give an example too)

addNumbers = function(x, y)
	return x + y
end
 
print(type(addNumbers)) -- why does this print function

function PlayerAdded(p) -- why is there a p as an argument, do we really need it there?
	print(p.Name) 
end
 
game.Players.PlayerAdded:connect(PlayerAdded)

function addNumbers(x, y)
    return x + y
end

print(addNumbers(1+2)) -- should print 3

function PlayerAdded(p) -- why is there a p as an argument, do we really need it there?
    print(p.Name) 
end

game.Players.PlayerAdded:connect(PlayerAdded)

The PlayerAdded event returns the Player that is joining. the p in the event is the argument for the Player that can be referenced in the function as you did with p.Name