In this lesson, you learned about namespaces that are used to construct logical hierarchies. You created a new project with a new namespace, made new public classes, calculated interest, worked with dynamic link libraries, created a new website from a template, and made a library accessible.
In the next lesson, you are going to learn about structs. Structs are usually used to represent simple composite objects, such as a point, where you basically have x and y coordinates, and the idea of structs is that these are value types, not reference types.