Bootstrap is the most popular HTML, CSS, and JavaScript framework for developing responsive mobile-first web sites.
These components are very important to you for web design and development.
Glyphicons, Dropdowns, Button groups, Button dropdowns, Input groups, Navs, Navbar, Breadcrumbs, Pagination, Labels, Badges, Jumbotron, Page header, Thumbnails, Alerts, Progress bars, Media object, List group, Panels, Wells
These are also main components of Bootstrap in Web Designing
1) Scaffolding – It has the grid system, background, styles.
2) JavaScript Plugins – Contains JS and jQuery plugins.
3) Customize – Can customize frameworks.
4) CSS – Contains CSS files.