Why should a prayer be done for expressing gratitude?

Prayer is actually a synonym for surrender. This act of surrender is completed only after the expression of gratitude. Gratitude is a means of offering the doership of an act to God / the Guru; hence it helps in reducing the ego.

Complete act of performing Arti

The various acts to be performed during Arti such as blowing the conch, clapping, lighting the lamp, etc. are given in this article.

How to offer Arti?

Arati means calling out to God with intense yearning. If a human being calls out to a Deity through the Arati then the Deity grants him a vision in their own form or in the form of light.