I can move the camera around; Left click and drag to pan, right click and drag to rotate the camera, alt+left click and drag to orbit the camera around a point, and alt+right click and drag to zoom in and out.
By selecting the move tool
I also learned about the "Hierarchy", and "Parent-child" relationships.
The Hierarchy is the list of every object in the scene.
It is called a 'hierarchy' because objects are grouped with the top object as the "parent" object (underlined in red), and the rest as "child" objects (underlined in blue).
Making an object a 'parent' means that all its child objects are moved, rotated, and stretched as one object if you are editing the parent object. It is possible to still edit child objects separately though.
Tomorrow I plan to go through #5 and 6 of the Unity Interface tutorials.