Where to place bootstrap row class

Question

Im fairly new to bootstrap and the concept of responsive design.

I was reading over the bootstrap docs and following some tutorials on w3schools. All mentions

Answer 1

The .row class is not required inside a .container, but it is a good idea to include it anyways when you start incase you want multiple rows later on.

All that .row really does is make sure that all of the divs inside of it appear on their own line, separated from the previous and the following .rows