From publisher blurb:
It is time to go back to College. But these colleges aren't like anything you've ever attended. Witchology 101 is a sourcebook for Modern d20 games that adds a little spice and fun to your magically-inclined campaign. Witchology 101 provides you with a secret world within the modern world where witches juggle their magical studies with their daily lives. Includes 30 new feats, 20 new spells and rituals, and new creatures (Brownies, Gremlins, Hobs, Wisps, and Thought Beasts).
This sourcebook is primarily a resource for storytellers, who want to add a more immersive magical element to their game.