1) If you’re using a project like Bourbon -i.e., something hosted on github or some other publicly accessible location- then you can bring a fresh copy to your project fairly simply. In the case of github, you can just clone into your project sass directory.
This is not what
@import does, however; you have to do it yourself. @import does not literally fetch files. Sass cannot read files that are not available locally (though there are mods that allow such things.).
2) If you like CSS and don’t want to worry much about the fact that sass is a programming language, use the
.scss syntax. If you’re a programmer, however, I highly recommend the
.sass (“indented”) syntax. It is very, very nice.
If you ever want to use a file that is written in the syntax you don’t prefer, sass can convert between them the same way it compiles to css.