I\'ve read several of the SO answers to what .container and .container-fluid are, but what I am missing is simple. Do I use column classes like col-xs
The container-fluid is used to contain the grid (row + col-*) but can be used for other things such as headings, tables, etc..
So no, container-fluid is not a replacement for columns, it's a holder of columns. The only difference between container-fluid and container is that the container is not full-width on larger screens. The container is a fixed width that's centered with large margins on the sides. container-fluid doesn't resize, it's always 100% width. Container demo
If you want to use the responsive grid (rows and columns), you need to use container or container-fluid like this..
(one or more col-*-* here)
Or
(one or more col-*-* here)
Read this article for a complete explanation.