Most white nationalists believe it’s enough to read Kevin MacDonald’s third book of his trilogy on Jewry. But the first book presents the roots of Judaism in a way that the secondary branches can later be grasped. I won’t add excerpts of MacDonald’s A People That Shall Dwell Alone, only a paragraph:
This project attempts to develop an understanding of Judaism based on modern social and biological sciences. It is, broadly speaking, a successor to the late-19th-century effort to develop a Wissenschaft des Judentums—a scientific understanding of Judaism. The fundamental paradigm derives from evolutionary biology, but there will also be a major role for the theory and data derived from several years of psychology, including especially the social psychology of group behavior.
See the prologue of the third book: here. Written when MacDonald finished his trilogy, it’s the best introduction to his whole trilogy that I know.