Options

Numpad 1: God Mode
Numpad 2: AI Can't Attack
Numpad 3: Super Melee Damage
Numpad 4: Add Gold
Numpad 5: Super Health
Numpad 6: Super Magicka
Numpad 7: Super Stamina
Numpad 8: Super Max Weight
Numpad 9: Unlimited Dragon Souls
Numpad 0: Super Speed
Numpad /: Unlimited Lockpicks
Numpad *: Add Level
Numpad -: Level Up All Skills
F1: Add Perk Points
F2: Fast Shout Cooldowns
F3: Free Crafting Materials
F4: Unlimited Ammo/Items

Notes

Numpad 1: God Mode - toggle on and your character is immune to damage. Also, you have unlimited Magicka, Stamina, and many kinds of ammo such as arrows will be unlimited.

Numpad 2: AI Can't Attack - toggle on and most AI cannot engage in combat.
    
Numpad 3: Super Melee Damage - toggle on and melee damage in the game is  super powerful.  Probably best to turn on God Mode before using  this.  You can kill things with one punch in most cases or with swords, etc.

Numpad 4: Add Gold - press I to open the inventory.  Note the amount of gold you have.  Press this key to add more.  Leave the inventory and then come back to see it has changed.

Numpad 5: Super Health - press TAB to enter the Character Menu.  Then select  the SKILLS menu item.  Note your current value.  Press this to add more.  Leave and come back and you will see this has changed.

Numpad 6: Super Magicka - press TAB to enter the Character Menu.  Then select the SKILLS menu item.  Note your current value.  Press this to  add more.  Leave and come back and you will see this has changed.

Numpad 7: Super Stamina - press TAB to enter the Character Menu.  Then select  the SKILLS menu item.  Note your current value.  Press this to  add more.  Leave and come back and you will see this has changed.

Numpad 8: Super Max Weight - press TAB to enter the Character Menu.  Then select the SKILLS menu item.  The Max Weight is not displayed here, but this is the correct location to use the option.  Each press adds more.
    Leave this area and then open the inventory to see it has changed.

Numpad 9: Unlimited Dragon Souls - Works different!  You must have at least ONE Dragon Soul in your inventory, and have collected at least ONE WORD  to use Dragon Souls on.  Toggle the option on then press TAB to open the Character Menu. Then select the MAGIC menu, then select SHOUTS.  Then note your current value.  Then leave the menu all the way back until  you have no MENU showing.  Then re-open the SHOUTS menu and you will  see that you have plenty.  Toggle the option back off.  If you  do not have a WORD or a Dragonsoul, you can press ` to open the console and use the following console commands:

    player.teachword 13E22
    player.forceav dragonsouls 1

 Numpad 0: Super Speed - you must have first entered the inventory at least ONCE.  Leave the inventory and then toggle this on.  Next,  you must draw your weapon, or put it away, or cast a spell.  THEN you can move and  you will see that it is much faster.  This will reset if you enter  the inventory.

Numpad /: Unlimited Lockpicks - toggle on and even if you do not have lockpicks  you will be able to pick locks.  Probably best to use this option when  you don't have any lockpicks and need to unlock something.  Toggle off
    when not needed.

Numpad *: Add Level - press TAB to enter the Character Menu.  Then select the SKILLS menu item.  Note your current value.  Press this to add more.  Leave and come back and you will see this has changed.

Numpad -: Level Up All Skills - press TAB to enter the Character Menu.  Then select the SKILLS menu item.  Note your current values.  Press this to add more.  Leave and come back and you will see this has changed.  This option increases ALL of the skills.

F1: Add Perk Points - press TAB to enter the Character Menu.  Then select the SKILLS menu item.  Note your current values.  Press this to  add more.  Leave and come back and you will see this has changed.

F2: Fast Shout Cooldowns - toggle on and when you use your shouts, this will attempt to reset them more quickly.

F3: Free Crafting Materials - toggle this on when crafting things and you  will temporarily have plenty of the items needed.  Toggle off when  not needed.

F4: Unlimited Ammo/Items - if you are not using God Mode, then toggle this on and  many items that use ammo and possibly some other items will be  unlimited.  Even if God Mode is on, potions and many other items will    not be consumed if used.  If you are trying to drop things or discard things or maybe even sell things, you might need to toggle this off.