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Here is the lecture on tree walks and traversals by Prof Naveen Garg.
1. Recursive and Iterative Preorder Traversal of a Binary Tree
2. Recursive and Iterative Inorder traversal of a Binary Tree
3. Recursive and Iterative Postorder traversal of a Binary Tree
4. Program to find whether two binary trees are identical or not
5. Count the number of leaves, non-leaf nodes and nodes having one child in a Binary Tree
6. Level order and reverse level order traversal of a Binary Tree
7. Program for finding the size and height of a Binary Tree
8. Code for searching an element in a Binary Tree