The fundamental primordial beej mantra is “om”, it's the mantra from which all one other mantras were born. Every single beej mantra has a selected 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://baglamukhi72604.blazingblog.com/26771180/the-definitive-guide-to-beej-mantra