WHAT ARE THE FIVE TYPES OF YAJNAS?

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