I want to cultivate a hobby for my mother.

If she doesn't like going out, teach her to surf the Internet (such as chatting, fighting landlords and watching movies and TV series).

If she loves to go out, let her go to the square to dance with everyone. If conditions permit, she can sign up for some classes for the elderly, such as playing the piano, drawing, yoga and dancing (it is said that your mother is too old to do these things, so it is called an old class).

There are cats and fish to raise, and this is easy to raise.