GG-01: An introduction - YouTubehttps://www.youtube.com/watch?v=ual-BuW7CiI
GG-02: gits inner workings - YouTubehttps://www.youtube.com/watch?v=Y0wFEhxVPa0
GiG-04: Trying tree traversal - YouTubehttps://www.youtube.com/watch?v=6KfRXVgFIYc
GiG-05: Traversing Trees - YouTubehttps://www.youtube.com/watch?v=sud6_UOCKdE