Bootstrap has to be one of the most popular front-end development framework today. This responsive framework is using a 12 grid system which also happens to be the most important concept in Bootstrap. Bootstrap grid is made up of three things namely a container, rows, and columns. You can create up to 12 grids under one row and remember you can create unlimited rows. Applying this concept when working with Bootstrap will help you create nested grids. If you are new to the Bootstrap grids system, do check out this introductory Sitepoint article by Syed Fazle Rahman about understanding the Bootstrap grid system.

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