Those who have not performed Sharda Pujan on Diwali, perform pujan of their new ledgers today and ritually open their shops and businesses. In the days following Diwali including today, people visit friends and relatives, to renew solidarity. Sweets and other items are offered to guests, symbolically 'sweetening' relations.
'Labh' means benefit. People today usually wish for material 'labh' such as: a good job, good in-laws, riches and so forth. Yet the scriptures and sadhus inform us that the greatest 'labh' is human birth itself. With this one should endeavor for God-realization.
The scriptures define 'labh' as:
Laabhasteshaam jayasteshaam kutasteshaam paraajayaha,
Yeshaam indeevarashyaam hrudayastho janaardanaha.
i.e. He is the true beneficiary and the truly victorious, who has installed the consort of Lakshmi, God, in his heart. Diwali then, is a festival of inner enlightenment. It is an occasion to eradicate one's inner darkness, by renouncing any addictions, bad habits and 'doshas' - base instincts, by obeying the God.