I'm not a Libertarian, but I respect most of what Libertarianism is about, having been around a few in my life.
Their bottom line, my take, is that they are about personal responsibility for one's actions and habits, properties, money, education and other aspects of human life in a society; they eschew laws being thrown onto the books to cover any and every corner of our lives.
Liberals seem similar at times, but I think they part company with Libertarian philosophy at activism, and perhaps in other ways as well. But it is not difficult to see them as allies against rampant, moronic conservative control-freak policies.