For most beginners, full Auto is best used only when you need a quick snapshot or you hand the camera to someone else. It gives up too much control.

A better approach is to use semi-automatic modes:

• aperture priority (A/Av): Great for general photography, indoors or outdoors, when depth of field matters. You choose the aperture and usually ISO; the camera sets shutter speed.
• shutter priority (S/Tv): Useful for sports or motion, when you need to control blur or freeze action.
• manual (M): Best when lighting is consistent, when using a tripod, in studio setups, or when you want full control and can adjust using the meter/histogram.
• program (P): Some photographers use it for quick shooting, but it offers less creative control than A/Av or S/Tv.

Outdoors in sunlight, aperture priority is often a good default because you may care about depth of field. Indoors, aperture priority can still work well, but watch that the shutter speed doesn’t drop too low for handheld shots. If motion is the main concern, switch to shutter priority.

In short: avoid relying on full Auto; use A/Av as a general starting point, S/Tv for action, and M when you need consistency and full control.