Whoever fails to fast Ramadan, or breaks the fast during it, for a legitimate excuse such as sickness, travel or menses, what he is required to do is to make up the days that he did not fast , according to scholarly consensus, because Allah, may He be exalted, says (interpretation of the meaning):
“and whoever is ill or on a journey, the same number (of days which one did not observe Saum (fasts) must be made up) from other days.” [al-Baqarah 2:185]

It is not permissible to delay making up missed Ramadan fasts until the next Ramadan comes without an (valid) excuse. If a person delays that, then he must offer the Fidyah: feeding one poor person for each day.

If fasting is too difficult for an old man or an old woman, and will cause them intense hardship, then they are allowed not to fast, and they should feed one poor person for each day. If they are also unable to feed a poor person, then they do not have to do anything, for “Allaah burdens not a person beyond his scope” [al-Baqarah 2:286].

Kaffarah is a compensation made by Muslims for intentionally breaking the fast during the month of Ramadan without any valid reason.

You must fast continuously for 60 days or if you are unable to do that, then you have to feed 60 poor people.

Zakat al-fitr is obligatory for every Muslim, to be paid on his own behalf and on behalf of those on whose maintenance he is obliged to spend, if he has wealth surplus to his and his dependents’ needs for the day and night of ‘Eid: one sa‘.