Bootstrap: Class reference

Question

This may seem like a dumb question, but is there an official bootstrap class reference? I looked on the website and was unable to find one.

I'm looking though some of the examples and I'll see stuff like:

<div class="container-fluid">

How am I supposed to figure out what all the contain-fluid tag does? Am I expected to dig through the css for every class to look at the rules and then divine how it will affect my page? That seems like a quick way to make assumptions and run into problems later.

Is there an official reference somewhere that I'm missing? I've seen some class lists compiled by third parties, but it seems like those are always going to lag behind new changes and may contain assumptions of intensions.

Answer 1

Not official but current as of 2/2016 https://bootstrapcreative.com/resources/bootstrap-3-css-classes-index/

Printable pdf and a sortable table with descriptions to help sort through the list of classes.

Answer 2

http://www.tutorialspoint.com/bootstrap/bootstrap_quick_guide.htm contains a very good reference for many of the bootstrap layout and css components.