I wanted to get into web3 stuffs as Frontend Developer but have lot's of doubt, if some one having experience in this field can answer it?

1. What all I need to learn & any courses if some can suggest?
2. I already have working knowledge of React.js. How much time can it take to learn techs related to web3?
3. What are differences in salary for a web3 developer & normal frontend developer?

Any other suggestions which I need to know before getting started?