Understanding the grid classes ( col-sm-# and col-lg-# ) in Bootstrap 3

Question

I\'m getting started on Bootstrap 3 and I\'m having some trouble understanding how the grid classes are meant to be used.

Here\'s what I\'ve figured out so far:

Answer 1

This might be late as I think most of us are using BS4. This article explained all the questions you asked in a detailed and simple manner also includes what to do when. The detailed guide to use bs4 or bootstrap

https://uxplanet.org/how-the-bootstrap-4-grid-works-a1b04703a3b7