There are several different mantras in Hinduism dedicated to various gods and goddesses. Depending on the nature of a devotee, he or she takes a liking to a particular mantra. There is one mantra is applicable to all gods in Hinduism.
Mantra for all gods is – ॐ (Om).
Om is the primordial sound from which life emanates. It is the sound that is reverberating through the universe. A cycle of creation starts with the sound of Om.
Om represents all the three stages of life birth, sustenance and transformation. There is no end to the Om sound it keeps vibrating.