Here’s some quick information from the project home page:
This Visual Studio ALM Ranger project has the primary goal of delivering scenario based and hands-on guidance for the planning, setup, configuration and usage of Visual Studio Lab Management, backed by custom VM Template automation for reference environments.
The content is packaged in 3 separate zip files to give you the choice of selective downloads. The default download is the first of the listed packages:
Guidance, which includes scenario based practical guidance and frequently asked questions.
Hands-on Labs (HOL), which includes the HOL documents that provide walkthroughs of the technology, based on the guidance.
HOL Package, which includes a HOL environment setup package which allows you to setup the HOL environment in your own environment.