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

Here you have a very good tutorial, that explains, how to use the new grid classes in Bootstrap 3.

It also covers mixins etc.