What are you favorite uses and tips for Charlesproxy

I have seen many useful options in charles but I feel I only scratches the surface on what can be done with it.
What are some interesting ways you have used charles or set it up?

Some of the interesting things that I’ve done with it

  1. Set a network breakpoint: When a specified request comes stop the network call and let you look at the application
  2. Re-write rule: Change the network response to simulate a failure