If you're recording an explainer video showcasing your software, B-roll footage might consist of shots of satisfied consumers using your product, or an external shot of your workplaces, for instance. Whatever Source need, figure it out during the pre-production phase to prevent circumstances in which you require video footage you don't have.
If you require a shot of something that would be difficult or impossible to film yourself, such as aerial shots or video footage from exotic areas, you can always use stock B-roll video footage. I've used footage from Beachfront B-Roll several times in the past, and the quality and variety of the footage is outstanding.
Structure is so essential it deserves a post in and of itself. However, because this is a crash course, we'll just cover the essentials in the meantime. Composition is the appropriate term for how a shot is framed and staged, or "composed." This refers to how your subject whatever it is you're filming is set up and placed within the shot.
Use the Guideline of Thirds Whenever you're recording anything (or taking photos), remember the "Guideline of Thirds." Picture your shot is divided into nine equal sectors by 2 horizontal lines and two vertical lines, like so: Notification how the primary topic in the image is positioned where two of the four points (which are known as the "anchor points") converge? This strategy is used to draw the eye toward the bottom lines of interest in the shot.