The Torah was (and is) believed to be divine, and in the same way as the Torah was accompanied by an oral tradition, so there grew up a secret oral tradition which claimed to possess an initiated understanding of the Torah, its hidden meanings, and the divine power concealed within it.
It is intended to provide a brief introduction to Kabbalah, and pointers to additional sources of information.
There has been a tendency for non-Jewish books on Kabbalah published this century to use the spelling "Qabalah".
Jewish publications are relatively uniform in preferring the spelling "Kabbalah".
The word "Kabbalah" is derived from the root "to receive, to accept", and in many cases is used synonymously with "tradition".
No-one with the slightest interest in Kabbalah can fail to notice that there are many alternative spellings of the word, the two most common being Kabbalah and Qabalah.