Affinity is: bravely choose what you like. In the process of choosing, you will naturally meet many like-minded people, get together slowly, and may become good friends in the future. So the first step is to become attached.
After you become attached, you should cherish it. For example, we have to have ten classes, and after the fifth class, we are doomed to have five more classes, so it is a pity to cherish these five classes. Everyone's design for the future is unreliable, and you can only grasp the present, so it depends on whether the present life is worth it. Do I like my present situation? If so, every moment of life can agree with what you have done, and the whole life is happy.