Bootstrap's responsive grid comes in 4 sizes or "breakpoints": tiny (xs), small(sm), medium(md) and large(lg). These 4 grid sizes enable you create responsive layouts that behave accordingly on different devices.
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Because you don't want your Bootstrap site, to look like a Bootstrap site.
There's good reason why Bootstrap is the most used frontend framework in the world.
Bootstrap is matured and well-tested. It's a stable codebase that provides consistency.
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