Following are the steps to become a UI/UX designer -
Learn all the fundamentals of basic terms in designing through books, internet
Choose any online course or Bootcamp
Design interfaces thoroughly
Join any internship to develop your skills
Finally, you can become a professional UI/UX designer. It is better to learn from any industrial experts by working on real-time projects for that I recommend everyone to learn this UI UX training course from Intellipaat. Where they provide industry standards of teaching which help learners to understand what the industry needs.
For your reference, I am attaching Intellipaat UI/UX free course video