Variations of Jewish Oral Law / Tradition

Many people who are interested in Torah / 'Judaism' struggle with accepting the idea that all of the Jewish traditions were given to Moses at Mt. Sinai by the Almighty, blessed is He! This difficulty goes away when we realize the distinct types of Oral law; not all of the "Oral Law" claims itself to have originated at Mt. Sinai. Infact, a large portion of it is self-proclaimed, according to the Talmudic texts, to be decrees instituted by the Mosaic Court. There are only 2 types of Oral Law given to Moses. The 1st time can be derived from the text of the Torah itself, by means of 13 principles of interpretation, and the other type are necessitated by the Torah's text, but can not be derived from the text -- and this latter type is only around 30 laws. It's not so hard to imagine 30 laws being preserved in oral tradition. The Talmudic texts never claim that every word of those texts were given to Moses. The compilers of the Talmudic texts would laugh at this idea.