1.  it's essential to have a deep understanding of the user. This means conducting thorough user research, creating user personas, and using them as a guide throughout the design process. It's also important to be able to empathize with users, understanding their needs, frustrations, and goals. This will help you create designs that are user-centered and intuitive.

2.  it's important to have a solid understanding of design principles. This includes understanding layout, typography, color theory, and how to use design elements such as contrast, hierarchy, and whitespace to create visually appealing and easy-to-use interfaces. A good designer should be able to create wireframes and mockups that clearly communicate the design intent and can be easily understood by other stakeholders.

3. it's crucial to be able to iterate and test your designs. This means being able to gather feedback from real users, test your designs with different user groups, and be open to making changes based on the feedback you receive. A good designer should be able to identify areas for improvement and be able to make changes to the design in a quick and efficient manner.

In summary, the three basic rules of becoming a UX/UI master are to have a deep understanding of the user, a solid understanding of design principles, and the ability to iterate and test designs. By following these three rules, you will be able to create user-centered designs that are visually appealing and easy to use.