information on the internet is tricky. i mean there can be a thousand and one opinions saying the same thing only to find that the information is based on popular opinion and not practical experience. I have read that Blood magick amps the energy in your spells and rituals. I am a beginner but i need something that can be like training wheels and i feel blood magick can do that. There are no books out there on it except for books on necromacy.
I don't use "Blood Magic", but this is what I've read about it:
"Blood Magic" is actually the use of blood in a ritual or spell. Blood symbolizes life force to its practitioners, and they believe in blood making.their spell/ritual more powerful.
It's like having a bowl, and filling it with your own blood, and using it as a focal point for the spell/ritual.