There are basically only three rules in life – the first, as all of human history and certain modern current events prove 99.9% of people are born in the world / die stupid – and if you wish to buck the trend, as King Solomon, the wisest of men said, “The beginning of wisdom is fear of God” which practically means, as he says “The only reason we exist is to fulfill the will of God” – The second is the ability to discern that will, which generally speaking comes from the Torah and Mitzvos, and specifically speaking comes from “the language of God.” And last but not least – all of Judaism, besides “the language of God” boils down to in simple English “Don’t be a jerk”.