What is Bootstrap ?? why we need to learn it ?? is it more efficient that HTML 5 ??

Answer 1

Bootstrap is an external library that is meant to make web development easier. Bootstrap consists of HTML, CSS, and JS libraries, which is code that you can reuse in your own. How efficient bootstrap is depends on your project. If you are working on a complex task, don't reinvent the wheel. Use a library. However, if working on a small project, using an external library can just slow down your page, because the client will have to download the entire library for almost no reason. Ultimately, the judgement is yours.

Answer 2

Bootstrap is a framework, not another language to be compared to HTML. In fact, it is build up using HTML 5, CSS and jQuery (JavaScript).
You just need to learn it if you're going to use it. It's like a library of ready-made styles for layout and style. You either download the files to your computer or link to them directly. There's a guide on how to use Bootstrap and it's fairly easy.