Bootstrap Chapter 3 – Bootstrap Grid System

What is Grid ?
In graphic design, a grid is a structure (usually two-dimensional) made up of a series of intersecting straight (vertical, horizontal) lines used to structure the content. It is widely used to design layout and content structure in print design. In web design, it is a very effective method to create a consistent layout rapidly and effectively using HTML and CSS.

What is Bootstrap Grid System ?
Bootstrap includes a responsive, mobile first fluid grid system that appropriately scales up to 12 columns as the device or viewport size increases. It includes predefined classes for easy layout options, as well as powerful mixins for generating more semantic layouts.
Bootstrap Grid System is used for creating page layouts with a series of rows and columns.
Bootstrap's grid system allows up to 12 columns across the page.
Bootstrap's grid system is responsive, and the columns will re-arrange automatically depending on the screen size.
Remember that grid columns should add up to twelve for a row. More than that, columns will stack no matter the viewport.

Bootstrap Grid System is made up of 3 things:
Container.
Rows.
Columns

Bootstrap Grid System Rules :
Rows must be placed within a .container or .container-fluid for proper alignment and padding.
Use rows to create horizontal groups of columns
Content should be placed within columns, and only columns may be immediate children of rows.

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