First of all, let us know how to worship Purnima.
On the full moon day, wake up early in the morning and take bath and mix Gangajal in your bathing water. After that clean the temple of your house thoroughly and purify it by sprinkling Gangajal in it. Now after this invoke all the deities and anoint the idol of Lord Vishnu with turmeric or tilak them with turmeric and then offer Tulsi Dal to them. Tulsi Dal is very dear to Lord Vishnu, so Tulsi Dal must be offered to him in every worship, due to which the worship is considered complete. Along with Lord Vishnu, one must also worship Goddess Lakshmi on the full moon day. After this, offer bhog of satvik things to Goddess Lakshmi and Lord Vishnu and take a vow to fast in front of them. Worshiping the moon on the full moon day has special significance. Therefore, on this day the fast is broken only after offering water to the moon. Those who have observed the fast should see the moon after moonrise and break their fast after offering water to the moon. By worshiping in this way, you will get auspicious results.
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https://en.myjyotish.com/en/astrology-blogs/ganesh-chaturthi-2022-know-famous-temple-and-its-history