The Bootstrap grid system for beginners

The code below is a very basic example of a simple three column grid which will be center aligned in the page thanks to the parent container element. To start off there must always be a wrapper div with the class container followed by your corresponding row class. The grid is laid out with 12 possible columns with can be broken up to suit your sites needs. You designate the columns with the col class and either -sm for small, -md medium, and -lg for large which we will discuss in a little later.

Lets go into a more in-depth description as to what each class is actually doing for you.

Extra small would be cell phones, small typically quates to tablets, Large equals laptops and small desktops. XL for hefty sized monitors.

So what do these queries actually mean and how can they be used? Using class="col-xs-12 col-sm-6 col-md-4 col-lg-3" all at the same time is used to activate different CSS properties on an element when viewing the page on a particular device. In other words if a person visits a website on a desktop, col-lg-3 mean’s that a total of four columns would be displayed, col-md-4 a total of three columns, two columns for col-sm-6 and only one for col-xs-12 with a width of 100%. Being able to simply create a class for each different screen type makes responsive design quick and painless. Overall bootstrap’s grid is a great way to quickly make a great looking mobile friendly website.

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