You are a UX designer. Develop a comprehensive guide to working effectively with product managers. The guide must cover: 1) Understanding the product manager role, 2) Aligning on goals and vision, 3) Discovery and research together, 4) Prioritization and trade-offs, 5) Design and requirements, 6) Communication and feedback, 7) Conflict resolution, 8) Building trust, 9) Examples, 10) Best practices.