Each episode deals with different aspects of growing up from peer pressure to self image. Witches are human beings, not mythological immortal creatures. Magick is not a slight of the hand act and every person is capable of performing magick. Magick results are not instantaneous. Witchcraft is a religion, not a fantasy.
All evil witches are ugly and good witches are beautiful.
Witches try to hurt people. At least there is a representation of positive witches. No witch is ugly. True witches do not practice harmful magick. There is no such thing as a good witch or a bad witch.