In the course in width, one traverses by increasing depth at the root.
In-depth course: prefix
The in-depth journey are recursive paths. In prefix traversal, we always traverse the left subtree before processing the right subtree.
In-depth tour: infix
The in-depth infix route consists of going as far to the left as possible, and displaying the branches from left to right. This is equivalent to displaying the diagonals / from bottom to top.
In-depth walk: postfixe
It is a diagonal route from top to bottom.