Here are tips and cheats for Diablo.

1) While playing, always have your inventory open. If you do this, then when you are close to death, you can quickly put all of the items you are wearing back into your inventory. This way you will not lose items if you die.
2) Use the keypad to use belt items. It is easier to access them this way, and you wont mess up as easily. You should also put the belt items you are most like to use in slots that you find easiest and quickest to use.
3) To duplicate items, first put the item you want to duplicate onto the ground. Then, walk away from it until it is on the edge of your screen(so you can still click on it). Next, put an item you do not care much about on your belt. Click on the item on the ground. At the exact time you pick the item up, click on the item in your belt (this may take a few tries). Open you inventory by pressing "I". Put the belt item in an empty spot in your inventory. If you have done this correctly, your belt item will become the item you wanted to duplicate. This also works for Hellfire.