How do I edit players inventory?

How do I make the max amount of items in your inventory 3!

Howdy!

I'd try a function that checks the inventory every few seconds. A table with three strings gets updated with the names of the items. If no room is there, the item is destroyed. The possibilities are endless. Someone else might have different ideas.

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Well Sir, it is pretty simple. All you have to do to insert the item into the starter-pack and every player will have the item!!!!

No coding needed sir!!!!!!!!!!!!!!!!!!!!!!!!!!

The way I would go about this would be to utilise the ChildAdded event of instances.

You can connect a function to this event and determine the amount of items currently in the backpack with the length of the table returned by :GetChildren() when called on the backpack.

From there, you would want to compare the length of that table to some constant defined within your script/game, and if it is greater than this constant, the inventory limit has been exceeded. I will leave an example below but am not going to give you a full implementation, you will learn more by doing this yourself! :)

local Players = game:GetService("Players")

local MAX_ITEMS = 3 -- This is the constant I discussed earlier

local player = Players.LocalPlayer
local backpack = player:FindFirstChild("Backpack")

backpack.ChildAdded:Connect(function(newChild)
	local backpackChildren = backpack:GetChildren()
	local backpackSize = #backpackChildren -- the hash (#) here indicates that we want the length of the array

	if backpackSize > MAX_ITEMS then
		... -- Your actions
	end
end)

(I gave a bit more info there than I was planning to originally, but hopefully it's helpful)

A side note: In the future, please try to make an attempt at making what it is you want before you come here to ask as not only will you have a better chance at getting an answer, but it gives us more to work with. (see the community guidelines for more info)