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Puja means Worship.
In Hinduism puja is performed in praise of God either by singing vedic mantras, hymns, songs, shlokas, aartis and verses or by performing the Yagyas
Durga puja, Garia Puja, Kali Puja, Laxmi Puja, Saraswati Puja
Kharchi puja durga puja and garia puja
Yes Indeed after performing a Shuddhi-Havan Puja and taking a vow to re-adopt Hinduism
in Hinduism pooja tray has flowers, rice, sandal and diya, insense sticks. These all items are used to worship God and make him happy.