If you really don't know what to do to waste time, you can follow the teacher's rhythm. The curriculum arrangement of each major is different, and the emphasis of each semester is different. You can find a course you like, and then make a study plan as the goal of this semester.
Our major is actually quite substantial, and I believe everyone's major is very substantial, but in fact, many times, we don't enter the role to study ourselves well, and then make college life meaningless. I can't find the direction, and my daily pursuit is to play games and read novels.
If they can study their professional knowledge well, they won't feel very idle at all. And after four years in this university, you will find that you will improve greatly. When you really participate, you take every task of the teacher seriously. When you do your homework perfectly, you won't feel wasting time.
Of course, it is best if you have a goal from the beginning of your freshman year and know what you want. A person must have a goal first, so that you can make progress. In fact, I admire one of my college classmates. Now someone else is the president of the student union, and he was also a member of the department when he first entered. Others have a goal from the beginning of their freshman year and work in the student union every day. Although their grades were not good, others didn't waste time.
If you can play the game to the extreme, it is ok to play the game on behalf of the school, which is not a waste. But many people can't reach it, so let's take the game as a small entertainment and leave more time to get down to business.