In a few-shot prompt (giving examples), does the order or diversity of the examples matter more for the model’s performance?

In an API inference call, what is the functional difference between the System, User, and Assistant roles?

Instead of one giant 2,000-word prompt, why might you split a task into smaller, sequential prompts?

Why are delimiters like ###, """, or <xml> tags important in long prompts? How do they help prevent the model from getting confused between instructions and data?