Keep your subject away from the background indoors and out. Indoors, this will prevent ugly background shadows (when using a flash), and outdoors (as well as in), the background generally will be blurred, leading the eye to the main subject.
Allow rechargeable batteries to run down before recharging. Recharge every 30-60 days, even if in use or not. Carry a spare battery.
Read your manual, maybe read it again and keep it handy. Get comfortable with your camera before that “special moment” arrives. Today’s cameras are too complex to “know it all”. Practice – practice – practice.