In reality, you can substitute the name of any goddess and you'll be on the right track. Hecate Witch just means that the Witch worships Hecate. I will be talking about Dianic Witches tomorrow. I chose to put Hecate Witch in here because it seems to be the 'go to' type of Witch for all the movies. I'm not sure if Hecate Witches number predominately or if the people who write movie scripts do the bare minimum of research and stop as soon as they find a particular type of Witchcraft.
Hecate is the only Titan who retained Her powers once Zeus became king of the gods. She is the goddess of sex, death, and Witchcraft. She is a triple goddess, but She doesn't always fit into the neat maiden, mother, crone category. She can either be a very beautiful (maiden) or a very ugly (crone) woman. The death aspect is usually the third aspect. Dogs are the only animals who can sense Her presence and they will howl when She is near.
Hecate is the goddess of the three-way crossroads. This is normally shown as a straight road forking into two opposite directions. Statues of Her portraying three faces would be erected in the fork with one face clearly visible from each fork. Hecate is a goddess of time and limits and for this reason Her followers usually try to wrap up all business at the end of the month. This could be as simple as balancing the checkbook and restocking the pantry. I like the idea, and while I don't worship any god/dess in particular, I do try to keep things in order and plan ahead. A Hecate Witch practices like a Traditional Witch- it's an old practice with very set rituals and spells. Hecate has never failed me so I understand why people have worshipped Her since ancient Greece.