To be honest, learning Javascript should only take a week. It can take three months to master Javascript (which says something about Javascript), yet it only takes about a week to learn it.
Web apps (including frontend and backend): JavaScript is often used to create whole web applications. After you've learned this language, you may expand your knowledge by learning frameworks and libraries like React.js and Angular.
Yes, if you know html, CSS, and javascript, you can obtain a job. However, javascript (excluding frameworks/libraries such as React, Angular, Vue, and others) and CSS (excluding libraries such as bootstrap, SASS, and others) have low career prospects (almost negligible).
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