Duping is a complex and secretive process. It typically involves finding a specific flaw in a game's code or network logic. One known method involves manipulating the game's trade confirmation system; for example, a player might initiate a trade, and at a precise moment, force a disconnect from the server to confuse the system about which player actually received the item. The dupe method often becomes worthless once discovered, as developers rush to patch the specific vulnerability.
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Roblox developers and Roblox itself actively patch these exploits. Using a script executor is against the Roblox Terms of Service, and you will likely face a ban. Duping is a complex and secretive process