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Traditions of magic are collections of related magical knowledge, most notably specific spells that have similar or related effects. Anyone wishing to learn a spell must first be initiated into the ways of its tradition, though there are as many ways to do that as there are practitioners of magic. Some will learn from books, others through divine revelation, some by communing with nature and still others will find the power within themselves.
Some traditions are, by their very nature, tainted with the evil of the Demon Lord. These are known as dark magic There are also spells which, rather than belonging to a larger tradition, are instead learned only by those on a specific path of magical learning.
For more, see the Magic chapter in Shadow of the Demon Lord, starting on page 110. For a full list of spells, with sources, see the official reference table for spells on the official web site.
List of magical traditions