This manual will not give you the following:
Step-by-step instructions if those instructions exist in other Yocto Project documentation. For example, the Yocto Project Application Developer's Guide contains detailed instruction on how to run the Installing the ADT and Toolchains, which is used to set up a cross-development environment.
Reference material. This type of material resides in an appropriate reference manual. For example, system variables are documented in the Yocto Project Reference Manual.
Detailed public information that is not specific to the Yocto Project. For example, exhaustive information on how to use Git is covered better through the Internet than in this manual.