How do I know if a new child Is added?

Help and Feedback Scripting Support
1

2

Use .ChildAdded

local parentObject = yourparentobjecthere
local wantedChild = whatyouwantittobe -- you could use the name instead

parentObject.ChildAdded:Connect(function(child)
if child == wantedChild then -- to use name do if child.Name == wantedChild.Name then
-- stuff here
end
end)
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3

Do you know why Roblox uses : and . for functions? What’s the difference?

4 
object.ChildAdded:Connect(function()

. is for an event, so the event child added connects a function. Child added is not a function itself.
the :connect is for connecting a function
alternatively you could use

function what()
print("what the a")
end)

object.ChildAdded:Connect(what) -- notice the dot before child added and the colon before connect

sory if i dont explain clearly

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