The Fundamental primordial beej mantra is “om”, it is the mantra from which all one other mantras ended up born. Every single beej mantra has a particular god or goddess related to them. The types of beej mantras are— Yog beej mantra, Tejo beej mantra, Shanti beej mantra, and Raksha https://www.youtube.com/watch?v=7yoEpl90KUg