An advantage of A-Frame over other 3D technologies is that it provides the developer a means to rapidly create virtual environments using a standard 3D coordinate system and a syntax similar to HTML. Moreover, A-Frame offers the developer a set of 3D entities known as primitives that can be used to quickly build simple models representing real-world objects in an A-Frame scene. This chapter presents an overview of A-Frame’s 3D coordinate system as well as a brief introduction to HTML. In addition, an in-depth discussion of primitives will be presented, followed by a tutorial in which each primitive will be used to create a basic environment. This environment will then be enhanced by applying textures and importing complex 3D models into the scene to support realism.