Commands

There are many sites with full lists of commands like The Elder Scrolls Wiki, but since I do not wish except where needed to pass through a bugged quest that was not fixed by either official or unofficial patches, here are only the ones I will be using.

It's a work in progress, I will keep adding when I find time.  
 
Command Effect
  tcl   Toggle Collision.
Allows to walk through bugged doors or recover items or bodies that have fallen through a wall or floor. If any object is targeted in the console while using "tcl" command, it does not work, the targeting must be cleared in the console.
  tfc   Toggle freefly camera.
Add [1] to pause.
  tmm '#'   Toggle Map Markers:
[0] Disable all / [1] Enable all / [1,0,1] Show all, no fast travel.
  Lock   Lock any locked door or chest instantly.
  Unlock   Unlock any locked door or chest instantly.

 
Targeted Command Effect
  DamageActorValue   damageactorvalue [actor value id] [amount]
Lowers the given attribute by the desired amount. Use 'player.damageav' to change your own values.
  getrelationshiprank   getrelationshiprank [#]
Returns the numerical rank of the friendliness between two characters from -4 to 4:
* -4 - Archenemy
* -3 - Enemy
* -2 - Foe
* -1 - Rival
*  0 - Acquaintance
*  1 - Friend
*  2 - Confident
*  3 - Ally
*  4 - Lover