[acobster]

This is the best resource I've found about making your own grid goodness, if that's what you're after: http://j4n.co/blog/Creating-your-own-css-grid-system

This tool seems oriented at abstracting away a lot of detail, and to be aimed at solutions that have to scale. If I wanted to learn as I go, I'd start without the abstractions.

[Ndymium]

That has nothing to do with CSS Grid, though, which is what the IBM tool is about. CSS Grid being the new way to layout in CSS: https://www.w3.org/TR/css-grid-1/