The Isavasya Upanishad, one of the primary scriptures of Hinduism says Isavasyam idam sarvam that is this whole world is pervaded by god. The Rig Veda extols -Ekam sat viprah bahudah vadanti that is, Truth is one, the wise call it by many names.
Hindus believe in one Supreme Godhead called Brahman who is impersonal without form, shape or attributes, who is omnipotent, omnipresent and omniscient. He transcends time and space and he can be worshipped as the Supreme consciousness or Paramatma, as Light or Love. When God is viewed as a Personal Being he is called variously as Iswara or Bhagawan. He manifests as an image or Murti, idol or icon, which is viewed as a personification of Divinity. God is invoked through mantras, rituals, chants, Pujas, bhajans, songs etc, in short anything that lets a devotee tune in to thoughts of divinity and helps him focus his mind on Hindu Gods. He is worshipped out of love not fear. This is the most unique aspect of Hinduism. His glory cannot be fathomed though we get glimpses through the outpourings of His saints and devotees. Thus a personal god helps a worshipper to easily comprehend and connect with the otherwise inscrutable, incomprehensible Supreme. These forms are many and a devotee is free to choose his favorite deity or Ishta Devata. In short there is a whole range of Divine Operating System in this universe and thus we see many gods in the Hindu Pantheon. The Trinity comprising of Brahma representing Creation, Vishnu for Preservation and Shiva for Dissolution, the Feminine or Shakti aspect represented by Mother Goddesses like Durga, Lakshmi, Saraswati and the various Devatas like Ganesha, Subramanya along with many more comprise the Hindu galaxy of Gods.
Welcome to this section on Gods in https://www.hinduscriptures.com and learn more about each one of them.