AUTO (Fully automatic Mode)
Explanation: With the fully automatic mode AUTO the D5100 behaves almost like a simple compact camera, you just have to point the camera to your subject and shoot.
The D5100 will choose all camera settings based with generic defaults.
Many settings of the D5100 cannot be changed manually.
Recommendation: The AUTO mode should be used only at the beginning or by less experienced users.
To obtain more attractive pictures in all kinds of shooting situation there is no way to avoid dealing with the other modes and at least the most important manual settings.