BRoll is the supporting footage that spice up your A Roll. Let's suppose you are listening to a person saying something in the video and then as he speaks, you are seeing footage that is related to what he says. Confused? Well, watch the video and you will know 5 tips to shoot better B Roll.
As a budding filmmaker, these tips are quite helpful. I am going to use all of them in my next shoot. These will apply to you even if you shoot from your smartphone's camera. ;)