how to identify black magick?

[karthik55]

oops  ive got  satrun n mars in the first house within 6 deg n connected to 1st and 8th house.and i frequently have nightmares does that mean i could be influenced by black magic?
also, a friend told that by offering continous prayers to shri prathyankara devi n ones family deity helps protect one from evil spells.

[nangapunga]

I suggesst regulat chant of Gayatri Mantra.

Do chanting it when ever u hv Idle time during day

[SSB]

Good information, but how to protect from black magic?