Bootstrap can help you to build your sites faster offerring ready-to-use HTML/CSS code for different layout, buttons, forms. I got used to use such CSS-frameworks to save my time while building standard HTML layouts for my sites.
Bootstrap is a toolkit from Twitter designed to kickstart development of webapps and sites. It includes base CSS and HTML for typography, forms, buttons, tables, grids, navigation, and more.
Bootstrap is built with Less and was designed to work out of the gate with only modern browsers in mind.
More often I need layouts and forms with buttons.
Bootstaps has only 2 simple layouts:
Fixed layout – A basic 940px wide, centered container layout for just about any site or page.
Fluid layout – 2-columns. A flexible fluid or liquid page structure with min- and max-widths and a left-hand sidebar.
But it is not enough for real apps. Often I need 3-columns pages.
Bootstrap has one type of buttons with rounded corners with differnt styles.
BUT the buttons are not round in IE8.
It has many types and styles of alerts. A great thing to use in your app.