To defeat Diablo in his lair, don't take on Diablo until you have defeated all of his minions.
If you duel on battle.net, don't worry about losing your items. If you die you will only lose gold.
Use a Town Portal and place an item in front of the portal. Click on the item with your mouse and enter the portal. When you will be on town the item will still exists in your inventory. Return to the portal and the item will be where you leave it.
Instead of just searching for gold in the crypt, all you have to do is collect items and sell them back in town.
If you have a network/Lan Pcs
Start a game with two players and have one player give all there stuff to the other and sell it you get over 300 gold.
so just keep exiting the game and start with a new person every time and give it to your buddy that your playing with but you have to really know & trust the person.
This will make it easy to survive. You have 8 slots in your belt, right? Well, for the first three slots, place two full health potions and a full Rejuvination potion. This is your health quick-select section, where you should place potions intended to be used for health purposes. The Last three slots should have three Full mana potions. This is your mana section. Put potions intended for mana restoration in these three slots. In the middle two (this is the fun one!), put to useful scrolls, such as a town portal scroll for quick escapes, and a powerful scroll, such as a scroll of stone curse, for an offensive advantage ( offensive means attacking). Keeping this up will help you survive, especially in level 10!
befor you go into a big fight, with a boss, open a teliport back to town so when you die you dont have to walk all the way back to that boss.
There are many place in the labyrinth that the character can
use to his advantage when in combat. Two basic examples of
these are barrels and doorways.
Barrels not only are sources of hidden treasures, but they
also provide excellent blocking terrain for ranged attacks.
Since barrels can be have spells or arrows fired over them,
a sorcerer or rogue properly positioned behind a cluster of
barrels can fight back a large group of oncoming creatures.
Doorways can also be used very effectively for singling out
monsters when encountered in large groups. If you are swarmed
by a large group of creatures in the labyrinth, an excellent
tactic is to position your character just on the other side
of a doorway and take them on one at a time as they enter
into the doorway.
There are numerous other areas within the labyrinth that can
be used as strong tactical positions by players who are
looking for them. Keep your eyes open and your weapons ready!
To duplicate an item you must have a belt item and the item you want to duplicate. First drop the item you want to duplicate and walk to the edge of the screen(so that you can still see the item). Then walk over to the item and at the exact same time you pick it up click on the belt item(like a potion or scroll). Then you should have the duplicated item in your hand and the actual item in your inventory.
Using the Hacking Utilities to open the Dat (data) file, you can convert the diablo game to allow such things as God Mode, All Spells etc
Of Course, MultiPlayer gets into Crashes and so-on. I dont encourage this, though i leave u the option
Hold ctrl , alt and shift and type win in order to get indestructible weapons.