Is there really need to learn extra topics in html like bootstrap?

Question

Html

Answer 1

You don't have to learn bootstrap if you won't use it.

Bootstrap is library used to help you style your website faster, it have already defined styles and you just need to follow html pattern and set class names you need.
It is css library, and some codes use javascript, like navigation menu for mobile phone...

There are other libraries like bootstrap like taiwind css, bulma...
https://www.webdesignerdepot.com/2022/04/15-best-css-frameworks-professional-bootstrap-and-foundation-alternatives/amp/

If you plan to work as frontend developer I suggest you to learn:
Html, css, javascript, some css preprocessors like sass or less, some javascript framework like angular, react or vue, and some libraries like bootstrap.

If you are still new to coding it is better to focus more on language itself, than to learn additional libraries and frameworks.
When you learn enough and build projects you can start learning something new to extend your knowledge.