This material is excellent. It's layout is minimistically clear and clean, navigation is simple and instructions are easy to follow. Ideal for a first-time designer.
The site is an example of the layout and ease of management that it promotes in material design. All imbeded links with further examples work well and are what they claim to be - an example of how to go about a task or solve a problem.
Time spent reviewing site:
90 minutes - I became totally involved in all the steps.