As a member of an outer school of the Western Mystery tradition, the aspirant is introduced to the Qabalah.  The classical Golden Dawn system teaches a practical aspect of the Qabalah based on the Sepher Yetzirah, or "Book Of Formation".  The following articles provide the inquiring mind with more detailed  information regarding this ancient knowledge.
Qabalah And The Golden Dawn
Sepher Yetzirah
How to Write the Hebrew Alphabet
Classical Correspondences On The Tree
Introduction To The Kabalah by William Wynn Westcott
Introduction to the Kabalah Unveiled by S.L. MacGregor Mathers

Esoteric Order of the Golden Dawn