As we mentioned before, Shader Graph is currently only compatible with the Lightweight Render Pipeline. The easiest way to ensure that a project is using that pipeline is by selecting it as the Template when creating the project.
Once the project has been created, we make use of the newly added Package Manager, which allows you to install or uninstall different aspects of Unity. In this case, you have added the Shader Graph functionality.
If everything's included, Shader Graph has been installed successfully, and you should be able to work on the rest of the recipes for this chapter!