Anything you didn’t expect in your first year in high school?

Melesse

What I mean by that is, once you upgraded from middle school to high school, was there anything that you didn’t know about or didn’t expect which made you look dumb? For example, my older sister just graduated from the high school that I will be going to next year and she told me that something that she was caught off guard by was the bell to switch classes since her high school bell sounded different, and she just sat there looking awkward as everyone switched classes. I know to stay away from guys in the upper grades because most of them just want sex, but any other things to expect? Thank you so much!