There are five types of yajnas as follows: ahutam -- veda japam hutam -- homam prahutam -- BhUta bali brAhmahutam -- brAhmaNa pUja prASitam -- pitru pUja One has to worship Rishis by veda adhyayana, Devas by homas, Pitrus by SrAddham, BrAhmaNas by food and bhUtas by bali dAnam