Learn the basics of Auto Layout, get familiar with the various Xcode tools at your disposal, and see how to save yourself time and frustration with your layout tasks.
The “Download Materials” link has the document for each challenge and should have a “Challenge Finished” folder too. This folder has the project in the finished state. The document sometimes has hints or a walkthrough.
For those of you, who are wondering why your simulators are not showing up, change your iOS Deployment Target to the lower version (from 10.1 to 10, in my case).
Each video has a download link with the materials for that video. This introduction only has the pdf, but the next video, Part 2, has the starter project.