Here is an example of how a modular grid works and how the designer has used it to create and style his page. This shows how useful grids are and how they improve you ability to a an accurate and affective design.
We live in an interactive world. Everything is in flux: content, viewports, the screen – all changing, all the time. Digital is dynamic – it’s ever-evolving, and it’s our job as designers and developers to keep up.