The Legend of Zelda: Tears of the Kingdom is a massive open-world game, and as with every open-world game released to date, it has its fair share of glitches and bugs, although far fewer than other titles. While some of these issues can get annoying, a few others can be exploited to do things that are normally not possible.
Among these normally impossible things to do is the ability to duplicate shields and weapons. As the game, like its predecessor, features limited weapon durability, having a decent supply of powerful weapons and shields can really improve the experience of those who don't like having their tools of destruction break up in the middle of a fight without having a worthy replacement.
Drop the weapon and shield you want to duplicate, and make sure you have none equipped.Pick up the item with the "???" symbolOnce the window with the item information pops up, press the + button to open the inventory.Sort the inventory with the Y buttonEquip an item that you want to turn into a duplicate of the item you first dropped.Drop this item you have equipped and pick it up. It will be a copy of the first item you have dropped.As this is a glitch, we should expect Nintendo to patch it out from The Legend of Zelda: Tears of the Kingdom with future updates, so make sure to take advantage of it as soon as you can.