For casual photography, focus on a few simple habits:

• Hold the camera steady and press the shutter gently instead of jabbing at it.
• Use the half-press on the shutter button if your camera supports it, so it can autofocus before you fully take the shot.
• Don’t use flash automatically. It often hurts more than it helps, especially when the subject is far away or when shooting through glass or fencing.
• Pay attention to composition. A good photo usually has a clear subject and a pleasing arrangement in the frame. Looking at photos you like from other photographers can help train your eye.
• Take lots of pictures. Good photographers often shoot many versions of the same scene and choose the best one later.
• Edit ruthlessly. Delete blurry or badly focused shots, keep only the strongest version of similar images, and only share the ones that work.

A “good” picture is usually one that is sharp enough, shows the important subject clearly, and is pleasing or meaningful to look at.