What is a good way to memorize substitution?

A good way to memorize substitution is to practice using it in various contexts, such as solving equations or evaluating integrals. Create a set of example problems and systematically replace variables with new ones, reinforcing the concept through repetition. Additionally, visual aids like flowcharts or diagrams can help illustrate the substitution process, making it easier to recall. Finally, teaching the concept to someone else can solidify your understanding and retention.