In order to make a RWD, you just need to consider one thing.
"Ability of content to fit inside any device that look good and it will be for user to interact with that"
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Responsive web design is not a kind of program or framework. We can say it's a combination of various concepts using which we try to make our web page look good on all devices
The great thing is that you can achieve RWD using HTML and CSS only⚡
You’ll develop a strong understanding of React’s most essential concepts: JSX, class and function components, props, state, lifecycle methods, and hooks. And able to combine these ideas in React’s modular programming style