All sins can be destroyed by observing this Ekadasi.
The root cause of all the problems in this world is illicit association with the opposite sex, and this is described in the Srimad-Bhagavatam.
The five types of sins that exist.
We should not invite or call anyone to eat on Ekadasi day, nor ring the bell.
The nature of women is to perform bhajans.
In Kali-yuga, women have more bhakti, this is explained in the Mahabharata.
Katha of the king who observed the Ekadasi fast in a previous life.