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The demand of web developer is increasing day by day .So if you want to work on google you have to become a very good web developer : https://www.quora.com/What-is-the-future-of-a-Web-Developer-Is-it-a-good-career-path https://medium.com/@globalemployees116/is-web-development-a-good-career-choice-in-2020-1d239170cb51
Yes, and no. Depends on whether you have practiced what you have learned and build a nice portfolio.
Yes If u know web development very well and can develop websites or apps then you can definitely work at Google
Yes. With the language you have learned will probably give you a job as a web dev. Even still you still need to practice and build responsive project to stand out from the crowd