Rabbi Shneur Zalman is well known for the Shulchan Aruch HaRav, his version of the classic Shulkhan Arukh, an authoritative code of Jewish law and custom commissioned by Rabbi Dovber of Mezeritch and composed at the age of twenty. The Maggid of Mezeritch sought a new version of the Shulchan Aruch for the Hasidic movement. The work states the decided halakha, as well as the underlying reasoning. The Shulchan Aruch HaRav is considered authoritative by other Hasidim, and citations to this work are many times found in non-Hasidic sources such as the Mishnah Berurah used by Lithuanian Jews and the Ben Ish Chai used by Sephardic Jews. Rabbi Shneur Zalman is also one of three halachic authorities on whom Shlomo Ganzfried based his Kitzur Shulkhan Arukh (Concise version of Jewish law).
Read more about this topic: Shneur Zalman Of Liadi, Works