Breakpoints are essential when creating compatible sites for the array of modern day handsets and devices.
Usually this is done with media queries but they take quite some time to write out, a recent search resulted in a great media queries mixin which I'm now using across all of my current SCSS projects.
Team this with a bunch of handy IDE shortcuts and you're quickly writing media queries with ease.
Here's our mixins file:
I'm also using pre-defined shortcuts to easily produce these snippets for each breakpoint within my IDE.
This is different for each IDE, I've edited mine for PHPStorm and it looks something like below: