I came across this video on YouTube by Peter McKinnon on DSLR camera basics. I do not own a dslr myself, as they are very pricey. I just stick to my iphone 6+ camera. DSLRs can be a bit intimidating, but this video breaks down everything into simple terms and analogies. Peter uses cereal as a metaphor for shutterspeed, milk as the aperture, and a spoon as ISO. One needs all three in order to properly enjoy a bowl of cereal for breakfast. Shutterspeed can stop action, freezing it in time or blur motion depending on what setting its on. Aperture lets light in as well as change what happens in the background. Finally, ISO comes into play in low light situations. The way he explains each term and shows examples of him working with the camera really helped to clear some things up for me.