There are many commands so it wouldn't be realistic to list all of them. You can find many of them here: Link
Just hit the tilde key (top left of the keyboard, below the escape button) and type in the code you want. If you wanted an item, for example, you would hit tilde, then type player.additem (item code) (quantity)
A list of item codes can be found here: Link
thanks very much for your help