How does one repent from repeatedly swearing to do something that has not been done, and is expiation for an oath (kaffarat al-yamin) required for each time one swore, or is a single expiation sufficient?

A Muslim should avoid excessive swearing so as not to fall into embarrassment or to trivialize swearing by Allah. If someone swears to read a book, they break their oath if they do not do what they swore to do. If they specified a time, either verbally or by intention, and did not do it until that time elapsed, then they have broken their oath. If they did not specify a time, they do not break their oath unless it becomes impossible to perform the action due to the death of the one who swore or similar circumstances. In "Al-Muqni'": If someone swears to do something and intends a specific time, they are bound by it. If they do not intend a time, they do not break their oath until they despair of doing it. If they break their oath, a single expiation for an oath is required if the sworn-upon thing was one, and the repetition of the oath was not intended for establishing a new oath but for emphasis.