The Brickyard page of Shader Mixer provides a repository containing all the bricks that are at your disposal. Listed below are the top-level categories of the Default Bricks. Each page lists the immediate child categories and/or bricks, as they appear within the UI. Follow the pages as you would navigate the items in the list for information about each category and/or brick.
The repository also provides a top-level item to organize any Custom Bricks you might have. The hierarchy here will match that of the folder/file structure established at the location presented by using the Browse to Custom Bricks location... action, found in the Pane (Tab) Option Menu.