How to trace the parent of a triggered event?

So if i were to trigger MouseEnter() on a gui, how would I know which gui that event was fired from, without having to name every single gui? Is there a better way to do this? I am trying to create an inventory gui.

Use a for loop (iteration)

local inventoryItems = script.Parent.InventoryItems -- Change this to whatever your items are inside.

for i, v in pairs(inventoryItems:GetChildren()) do
   v.MouseEnter:connect(function()
         print("Mouse entered.")
   end)
end)

With this script, v is your GUI and i would be th iterator, or the number of the GUI object in the for loop.

There's most likely a better way to do this, and it might be using UserInputService, I would give you a more detailed answer with info on that but I'm on mobile and it'll take quite a while.