Any puja starts with invoking Lord Ganesha to remove all hurdles that may come in the way.

The Sri Maha Ganapati Aavarna Kalpamu book Telugu is a quick reference for the puja and vishi of Sri Maha Ganapathy avarana puja. Avarana puja is tantric in nature and usually performed for Goddess Lalitha. However, Ganesha is also equally important from a Shakta philosophy, where the Chaturavarthi tarpanam for example is performed on all chaturthi tithis.