This trick requires access to Arcane University, a Chameleon spell, two rings, a necklace / amulet, any two pieces of armor (preferably a helmet and shield; you could use any armor for this, but you may want to enchant them with defensive magic later), five Grand Soul Gems with Grand Souls in them, and 8,000 gold. Go to the Chironasium (enchanting section) in Arcane University. Go to an enchanting stand and enchant the necklace, rings, and armor with a Chameleon spell using the Grand Soul Gems. Each enchantment gives you 20% Chameleon effect, so all five enchantments will make you 100% Chameleon, which is not only invisible but also allows you to attack, steal, open, and pick-up without being revealed. You can now steal from a shop without the shopkeepers doing anything. Your enemies will also just stand still unable to attack, allowing you to go into Sneak mode and attack for 4x to 6x damage, and pickpocket without consequence (except on guards who can catch you if you fail, but still cannot attack you if you resist arrest). -From: andre.morgan
Equip a bow and any set of arrows, then draw your bow back. While it is drawn back, press B to go to the inventory screen. Select the arrows that you are using, then go to the item to be duplicated. Press X to drop the item, then leave the equipment screen and resume the game. The item that you dropped will be duplicated. You can pick up all the duplicates and use or sell them. The amount of copies of an item you make depends on how many arrows you have equipped. For example, 10 arrows allows 10 copies. This works with most, but not all, items and weapons. Note: Do not try to duplicate more than 250 copies of an item or the game may freeze.
Use the following trick for duplication or a permanent enchantment. You can duplicate a drop-able item, and if that item is equipable with constant effect enchantments you can make them permanent. However, the item once made permanent cannot be re-equipped, but each enchanted item is different. You can use the "Duplicate items" trick to make as many as desired, then sell them. Use the "Duplicate items" trick with a bow an arrows to duplicate the items to make permanent. Equip one of the items you want to make permanent. There must be an unequipped version still in your inventory for this to work. Use the "Duplicate items" trick again; However, drop the unequipped version of the item you have equipped and want to make permanent. The equipped one and the others will drop and you will never be able to equip that item again, but if you check your stats the items bonuses will be permanent. You can duplicate anything that can be dropped, including Grand Soul Gems with Grand Souls captured.
This trick only works with wearable items. Take any wearable item with a magical enchantment that you wish to make permanent and use the "Duplicate items" trick to duplicate it twice so that you have two of that item. Pick up the item and equip one. While you are wearing that item, duplicate the one you are not wearing by at least four. Note: The number of arrows used determines how many copies are made. Both items will drop on the ground in stacks of two. You will now no longer be wearing that item, but will still have its effects. Note: These effects are permanent. Do not attempt this with any item with an effect you may want to remove later, such as Water Walking, Night Eye, etc.
Use the "Duplicate items" trick on a potion of strong health. Repeat the duplication to get the desired amount of potions. Open the inventory screen and go to the strong potion of health. Hold Y and quick link it to one of the Analog-stick directions. When you are low on health, just tap the hotkey direction to use a potion. When running low on health potions, repeat the duplication process.
Use the "Duplicate items" trick on a Soul Gem. Pick them all up. When an item is on low charge you can recharge it back to full without wasting money on Soul Gems or having to bother with soul trapping.
Go to the Talos Plaza District of Imperial City and find a house owned by a man named Dorian (Dorian's House) in the southeast section of the district. Break into his house and find him. When he tells you to leave, kill him. Do not press X to loot him and take all. Instead, take each item individually, finishing with the gold, which will not run out once it hits 8 pieces. Just keep selecting the gold he is carrying and keep pressing A as usual. Do this repeatedly, and the number of gold pieces remaining will freeze when it gets down to 8 gold pieces. It will not go any lower, but will just keep giving you as much gold as desired. Note: After you break in and he tells you to get out, talk to him. Go to "Persuade" and bribe him a lot. After that, kill him. He will now have more money to loot, which makes it easier to get more faster.