Puja is a form of prayer. Puja is a term in Sanskrit that refers to the worship of a deity through the practice of certain ritual practices, such as offering prayers to a deity every day after taking a bath.
Sandhyopasana is a meditation on God as the light of knowledge and wisdom at dawn and dusk, which can be done at any time. 
Sandhyopasana is a meditation on God as the light of wisdom and knowledge at dawn and dusk, which can be done at any time.  
Arati: It is a type of worship, in which light or lamps are given to the deities in the midst of songs and prayer chants.
Homa: Homa is when offerings are made to the deity in a fire that has been properly consecrated.