What are the cases in which a father is obligated to financially support his children? And is the father obligated to financially support his son who is devoted to seeking knowledge?

The father's maintenance is obligatory upon his children during their childhood or if he is unable to earn, provided he does not possess wealth. However, dedicating oneself to seeking knowledge does not obligate maintenance if the son is able to earn or possesses wealth, unless he is unable to earn, in which case maintenance becomes obligatory upon the father if he is capable.