Bootstrap saves a lot of development time. Instead of writing a responsive website from the ground up, Bootstrap provides ready-made blocks of code you can use and customize to suit your specific needs. It has a large community base as well as excellent documentation, meaning it can easily be used for rapid development of responsive websites with little technical preparation. Using Bootstrap for a webpage or application gives it a level of professional consistency, that most of the world is already used to, even if we are reusing code.
One of the most powerful aspects of Bootstrap is the built-in grid system. It’s based on 12 columns. Containers can be set to Small, Medium, Large or Extra Large width for responsive viewing across all sizes of viewing platforms.