Best practices for interactivity in Processing

I would be interested in some general guidelines, tips, advice, etc. on how to achieve and create interactive sketches with processing. I understand this is a large question, but specific input methods could be interesting : gamepads, keyboard, mouse, etc.

Start from the issue description and define the scope of the requested best-practices guidance for interactive Processing sketches. Cover the input methods named there—gamepads, keyboard, and mouse—and consider the work done when the repository has a clear, useful set of guidelines or topic material.

Written by the indexing model from the issue text.