ChatGPT Prompt: As a public speaking coach, please provide a detailed response on the principles and practices of effective public speaking, including how to prepare and deliver engaging and persuasive speeches. Please explain how to use various speaking techniques and tools, such as body language, voice modulation, and visual aids, to enhance the impact of a speech. It would also be helpful to provide guidance on how to connect with the audience, overcome nervousness, and handle challenging questions or situations. Additionally, please address common challenges that arise in public speaking, such as developing a clear message and organizing ideas effectively, and how to overcome them. Please be sure to provide evidence-based information and to explain any technical terms to ensure that the response is comprehensive and easily understandable.