Easy to understand and manipulate to display on your website.
Tons of free package available and most of all its from github so managing your repo is that easy.
Super easy to setup to have your prototypes deployed with CI.
A simple way to host your static sites.
You don't have to worry about missing a dependency for your project.
Makes use of pre-processors very easy. It can build most of the popular templating tools.
Number of pre-made component.
Love how the inheritance works.