The fundamental primordial beej mantra is “om”, it's the mantra from which all another mantras were born. Just about every beej mantra has a particular god or goddess connected to them. The kinds of beej mantras are— Yog beej mantra, Tejo beej mantra, Shanti beej mantra, and Raksha beej mantra. https://yantra37260.nizarblog.com/26849190/a-secret-weapon-for-beej-mantra