The most fundamental of Hindu deities, is the Trinity of Brahma, Vishnu and Shiva - popular deities include Ganesha, Krishna, Hanuman and goddesses like Lakshmi, Durga,Saraswati.
Om Tat Purushaya Vidhmahe
Thanno Rudra Prachodayath.
Om, Let me meditate on the great Purusha,
Oh, greatest God, give me higher intellect,
And let God Rudra illuminate my mind.