Another term demystified.
Th Working Tree in Git is a directory (and its files and subdirectories) on your file system that is associated with a repository.
It’s full of the files you edit, where you add new files, and from which you remove unneeded files. Any changes to the Working Tree are noted by the Index (see below), and show up as modified files.
When you open the files for a project that is being managed as a Git repository then you are access the Working Tree.