The most important aspect of taking the best picture possible is to know your camera. Read the manual it came with. You will learn where the basic controls are located and how to use and set them. Once you learn the settings, you will be able to take the best picture in a less than ideal setting.
Next step, learn how to hold the camera correctly with both hands to steady it, any movement or shaking will blur the picture.
Lighting is the most important aspect in photography. Shadows and lightening can make the difference between an ordinary snapshot and a quality photo with depth.
People look best in diffused side lighting, back lightening produces a halo effect, while overhead lightening produces sharp contrasts. If possible, take pictures in the morning or late afternoon where the sun is not glaring overhead.
Taking pictures outdoors with the sun behind you and the subject in front, will get the best results. If your subject happens to be a person, make sure they are not squinting and pose them to the side.
For best results, utilize the single-shot auto focus setting, choose a single, central point to focus on and you will get the best photo.
When ready to shoot a picture take a look from another angle, it can make the difference between a good or a great picture.