The amount of time it takes to learn React depends on a variety of factors, such as your current programming knowledge, the amount of time you are able to dedicate to learning, and the resources you use. Generally speaking, it will take at least two months to become comfortable with React, and up to six months to become a proficient React developer. However, with only three weeks of dedicated learning, it is possible to learn the basics of React and create simple web applications with the library.
If you’re looking to learn React in three weeks, there are many great resources available to help you. The official React documentation is a great resource, as it is comprehensive and easy to understand. Additionally, online courses such as React for Beginners, React Tutorial, and React Crash Course can help you get up to speed quickly. Finally, the FreeCodeCamp React Course is a great free online resource for learning React.