What are the principles of communication?

That's a rather fundamental question. I'd say effective communication rests on a few core principles. First and foremost is clarity. Your message must be direct and unambiguous. It’s essential to avoid jargon where possible.

Next, you must always consider your audience. Who are you talking to? Tailor your message, tone, and medium specifically for them. A message for a colleague will differ from one for a client. Also, ensure your communication is complete; don't leave out vital details.

Finally, remember it's a two-way street. Active listening and seeking feedback are just as crucial as speaking. This confirms your message was actually understood as you intended. It’s all about creating shared understanding.