UI is a new industry, which is not only a matter of artistic vision, but also a matter of scientific rationality. Since it is a design, we can't indulge in pure art, and we must reach a compromise with the market to meet the needs of users. You need to learn many scientific theories and master the existing industry knowledge. UI design is a process that requires you to constantly compromise, compromise with users, compromise with existing technology, compromise with team size, and compromise with online time.
Interaction designers mainly study the relationship between user needs and interface, and design and plan product functions and interface interaction modules according to this relationship. For example, to build a website, interaction designers mainly consider who the target audience of this website is, what needs it meets, and what operating habits the target users have. Interaction designers will establish one or several user models according to the analysis of relevant demand research data, and then analyze the usage habits of these users and establish the design prototype of the website. This prototype can be an ordinary photo frame draft or a high-fidelity model, but it doesn't need the details of design elements and specific visual effects. Generally speaking, the work of interaction designers ends here.
I hope my answer is helpful to you ~