The Exposure Triangle Explained: ISO, Aperture, and Shutter Speed for Complete Beginners
Every camera you have ever used, from a disposable Kodak to a $6,000 mirrorless body, does exactly one thing: it controls how much light hits a sensor. That is it. Everything else, the tracking autofocus, the computational wizardry, the menus nested seven layers deep, is in service of that one job.