Care is the act of looking after someone or something and keeping them in a good state or condition.

If you do something with care, you give careful attention to it because you do not want to make any mistakes or cause any damage.

Your cares are your worries, anxieties, or fears.

You can use for all I care to emphasize that it does not matter at all to you what someone does.

If you say that you couldn't care less about someone or something, you are emphasizing that you are not interested in them or worried about them.

You can say 'Who cares?' to emphasize that something does not matter to you at all.

If someone sends you a letter or package care of or in care of a particular person or place, they send it to that person or place, and it is then passed on to you.

If you take care of someone or something, you look after them and prevent them from being harmed or damaged.

If you take care to do something, you make sure that you do it.

To take care of a problem, task, or situation means to deal with it.

If you care about something, you feel that it is important and are concerned about it.

If you care for someone, you feel a lot of affection for them.

If you care for someone or something, you look after them and keep them in a good state or condition.

You can ask someone if they would care for something or if they would care to do something as a polite way of asking if they would like to have or do something.