Your first thought must be "Why would I want my Tesla to be a creep?" ;)
In Model S, X, and 3, there is a drive setting named Creep which simulates the slow forward movement of an automatic transmission car that occurs when you release the brake pedal.
By default, Creep is set to "Off" meaning that when you shift your Tesla into drive and release the brake pedal, the car will not move (assuming you're on a flat surface). This is the natural and ideal setting for an electric vehicle, but it may be a little disorienting to new or occasional Tesla drivers. With Creep "Off", a motionless Tesla could actually be in Drive, Reverse, Neutral, or Park. In a moment of confusion or panic where the driver does not remember what gear the car is in, pressing the accelerator could result in movement in the opposite direction (e.g. you though you were in Reverse but you're actually in Drive).
With Creep "On", the slow movement that occurs when you release the brake helps you mentally confirm you're in the intended gear. Creep "On" also forces your foot to "ride the brake pedal" at least for the initial moments of movement, reducing the possibility of unintended acceleration (e.g. if you panic and step on the brake pedal, the car stops).
Therefore, it is recommended that new Tesla drivers experiment with both Creep "On" and "Off". Those that regularly drive both a Tesla and an automatic transmission car might prefer to keep Creep "On" for consistency. Similarly, those with a Tesla that will be regularly driven by others less experienced with a Tesla might also prefer to keep Creep "On". On the other hand, experienced Tesla drivers will likely prefer Creep "Off" as it allows for more "one pedal driving" (i.e. press the accelerator to go, release the accelerator to slow and stop).