Oath

Vow نذر when you commit to do a worship like fasting or praying recommended Prayers like Night prayer, or good act like helping needy or give something in good cause if you get your wish. 

Oath يمين is when you take oath to do something good or leave a bad deed like taking oath to leave smoking or leave attending mixed gatherings etc.

Covenant عهد is when you promise Allah (SWT) to do something good or leave something bad.
Fulfillment of vow, oath and covenant is obligatory.

If you don't remember what intention you had, you need to just fulfill what you had committed no matter what was whether vow or oath or covenant as all of them share a commitment which must be fulfilled. Failing to fulfill the commitment is a sinful act.

Wassalam.

You must feed ten ooor believers not only where you live but where ever you can reach to poor needy believer even if you sent the food to another country where poor believers can be fed.

Wassalam.

Fulfilling the oaths or promises to Allah (SWT) is compulsory (WAAJIB) as far as the person who made the oath of the promise is Aaqil (Sane). If the Waswasah makes the person insane, then insane person is not responsible for he does or says during that condition.

Wassalam.

Breaking the promise or oath done to Allah (SWT) is a major sin which can lead to Hellfire if not been forgiven. Kaffara is must on every broken promise or broken oath which is feeding ten poor believers or clothing them. If unable to feed or clothe them, then fasting three days as Kaffara.

It is important to remember that not fulfilling a promise or oath has dangerous result in this life and hereafter.

Wassalam.

Making a False statement by Qasam or oath or saying Wallah, is a major sin. It is called in the Hadeeth ( Al-Yameen al-Faajirah Al-Ghamoos) (The sinful oath which immerses the liar in the fire).

Seeking forgiveness needs: 1. Giving back the right of any one who was been wronged by this false statements and making him pardon you from his heart.

2. Repenting and feeling sad for what you committed.

3. Firm decision not to do it again.

 4. Seeking forgiveness from Allah (SWT) day and night.

Wassalam.

Feeding Kaffara must be given as food to poor believer and not cash. If you don't have access to ooor believers where you live, you can send the Kaffara to other places where poor believers can be fed.

Food banks usually give food to public with out the condition of faith, that is why, it is not allowed to give Kaffara to them, but you can give them general charity or donation for feeding general public.

Wassalam.

Kaffara of breaking an with is feeding ten poor believers or clothing them. Feeding  must be given in food not cash, to poor believers. It can not be given to food banks who give everyone from every faith. You can give the amount to any trusted Muslim charity or person who buys and distributes food for poor believers only.

Wassalam.

If you took an oath to do something which you know that it is wrong or you discovered later that it is wrong, then such oath itself is invalid. You don't need then to feed ten poor persons or clothe them or fast three days as expiation.

'Wassalam.

You should not sell the laptop which your father gifted you for your studies  but fast three days as Kaffara for breaking an oath.

Wassalam.

There is no Kaffara on non Baligh child, but if his parents wish to pay a Kaffara, they can do so but it is not obligatory neither on them nor on the child.

Wassalam.

This is not an oath but a Promise to Allah which is called is Shariat as عهد . The Kaffara not fulfilling the Promise to Allah is similar to the Kaffara of deliberately breaking fast of the month of Ramadan, which is feeding sixty poor believers or fasting of two months or freeing a slave which is not available now a days.

Kaffara of breaking an Oath يمين or not fulfilling Nathr نَذر (Mannat) is feeding ten poor believers or clothing them and if unable then fasting for three days.

Wassalam.