Controls the opening in your lens. A low number (like f/1.8) creates that blurry "bokeh" background, perfect for portraits. A high number (like f/11) keeps everything sharp from front to back.

Practice "Active Seeing." Even without a camera, look at the world and ask yourself: Where is the light coming from? What would my f-stop be?

Your camera’s sensitivity to light. Keep it low (ISO 100) for crisp shots in the sun. Crank it up (ISO 3200+) for dark rooms, but watch out for "noise" or graininess. 2. Composition: The "Rule of Thirds"