What is the ruling on money earned from training in an interest-based bank, is it considered lawful or unlawful, and is it permissible to spend it on oneself and one's family, or must it be disposed of through charity, especially given the existence of illiquid inheritance?

Money earned from working in a usurious bank is unlawful (haram) money. It must be disposed of by spending it on charitable causes, such as for the poor and needy, with the intention of disposal, not as an act of drawing closer to Allah. If you are in need, it is permissible for you to take from it according to your necessity. However, if there is something that suffices, such as a brother's provision or an available inheritance, then it is not permissible to spend from it on oneself because it is unlawful money. The Prophet, peace and blessings be upon him, said: "O people, Allah is good and does not accept anything but what is good..."