For these 9 evenings, you're expected to worship Goddess Durga in 9 distinct forms. People today observe rapidly of 9 days but it's not compulsory. Hindus carry idols of Devi Durga for their households or for the pandals wherever the Competition is celebrated publicly. Shakti is worshipped in the form https://www.youtube.com/watch?v=QIX0JZlLsgE