How to listen to heart and lung sounds?

Could you please elaborate on how to properly listen to heart and lung sounds? I'm particularly interested in the techniques involved and how they can assist in diagnosing various medical conditions. Could you describe the equipment used and the steps one should follow to ensure accurate listening? Additionally, I'm curious about any common mistakes to avoid and how to interpret the sounds effectively. I believe this skill could be invaluable in my medical practice, and I'm eager to learn more.