If you are starting from scratch, then start learning the following skills:
Basic programming skills in CSS and HTML
Intermediate-level knowledge and understanding of JavaScript
After that, enroll for an online course to learn React Js because it takes time to learn all the concepts by self-learning if you are a novice.
I recommend this React JS Training course by Intellipaat that teaches you all the skills necessary for learning and implementing React and to become proficient in React, several concepts of it, including JavaScript, creating a React app, and operators and expressions in React, along with many others.
If you are interested in web development, I strongly recommend these Web Development Courses by Intellipaat.
Also, watch this video on ReactJS developer to know more:
