These are just some suggestions
History of witchcraft
Closed/open religions
Sigils
Book of shadows
Types of witches
Moon phases
Elements
Talismans
Astral projection
Energy
Types of magick
Seals
Herbs
Types of spells
Symbols
Lucid dreaming
Grounding
Types of divination
Crystals
Deities (for pagan witches)
Spirits
Color correspondences
Crystals
Circle casting
Candle omens
Herbs
Tarot meanings