To start, follow simple and clear rules: clear navigation, minimal unnecessary elements, and a convenient menu structure. I myself used to struggle with these issues until I came across https://weelorum.com/blog/7-design-ideas-to-make-a-user-friendly-application/ , which provides practical advice and specific examples. It explains how to make the interface logical and easy to understand, even if the user has never used similar applications before. These recommendations helped me redesign my interface without unnecessary complexity.
