Lesson 11 of Practical Compositing in Nuke demonstrates how to use transform nodes.
For the complete lesson, go to https://learn.foundry.com/course/4692/view/11-transforms
For the full course, go to https://learn.foundry.com/nuke#practical-compositing-with-austin-meyers
For Nuke product information, go to: https://www.foundry.com/products/nuke