Lord Ganesha

Few things i know about Ganesha.

Mantras -
Vakratunda Mahakaya Surya Koti Samaprabha
Nirvighnam Kurumeydeva Sarva Karyeshu Sarvada
"O Lord Ganesha of Large Body, Curved Trunk, With the Brilliance of a Million Suns, Make All My Work Free Of Obstacles, Always."

Ganesha Beej Mantra (Ganapati Upanishad) - "Om gum ganapataye namaha"

Ganesha’s Gayatri Mantras - "Ekadantaya Vidmahe Vakratundaya dhimahi Tanno Dantih Prachodayat"

Ganapati Atharvashirsha 
Read this to understand the deep meaning of Ganapati Atharvashirsha

Ganapati Aarti - Sukhkarta dukhharta Varta Vighnachi