This lesson teaches you how classes can "build off" of one another. It's called class inheritance and subclassing and it will save you a ton of time and rewriting of code!
Furthermore, it's used everywhere in the UIKit classes!
In lesson 2, you'll learn about Auto Layout which is the Xcode uses to size and position elements on your user interface.
You’ll work on a practical app user interface while learning the ins and outs of Auto Layout.
Learn how to add, edit and remove constraints to size and position the elements on your screen.
Learn how to add images, text and dimmed views to your user interface.
Learn how to construct your layout in a way so that it works for all screen sizes and orientations!