Alternatively, you can also download the Bootstrap’s CSS and JS files from their official website and include in your project. There are two versions available for download, compiled Bootstrap and Bootstrap source files.

Compiled download contains compiled and minified version of CSS and JavaScript files for faster and easier web development. The compiled version also includes optional JavaScript dependencies such as Popper bundled with Bootstrap JS (bootstrap.bundle.*). Whereas, the source download contains original source files for all CSS and JavaScript, along with a local copy of the docs.

Download and unzip the compiled Bootstrap. Now if you look inside the folders you’ll find it contains the compiled CSS and JS files (bootstrap.*), as well as the compiled and minified CSS and JS (bootstrap.min.*). Use the bootstrap.min.css and bootstrap.bundle.min.js files.

Using the minified version of CSS and JS files will improve the performance of your website and saves the precious bandwidth because of lesser HTTP request and download size.

Tip: There’s no need to include the required Popper.js (in order to make the Bootstrap’s tooltip and popover components work) separately, as it is already included in the “bootstrap.bundle.js” and minified “bootstrap.bundle.min.js” files.