Bootstrap 3 is the great step for a web world in the future. It’s addressing mainly device’s needs which is going in line with how world is changing, going to be mobile. Let’s take a look on new things that version 3 introduced.
- Mobile First Responsive Web Design – see great post describing the idea.
- Fewer classes, no more ‘fluid’ – make things simple.
- Responsive by Default – make everything responsive.
- Less collisions with your own CSS – improvements in internals.
Just one more note, as bootstrap is becoming more and more popular you could find many great free templates for your pages. One great source of that you could find here http://bootswatch.com.