criterias on black/white magic?

[fixme]

I wanna ask there, what is the criterias of black magic when you send negativ energies?
I mean, energy don't know space and time, so it have an effect, but if we not even met with a people just know it from online, can we heal it, or send it negative energies by their name, birth date, or pictures of them? did the pictures/name of people connected with them, so the energy, and the Gods will know who I think about correctly? Sorry, it's not clear a bit. I know we need many experience for these things, but I am just curious about my question below. That our energies find the goal if we didn't met yet with someone but we seen a pic, know their name, etc..