Going to class
This is obvious, but…
Of course you know this, but it’s best to make this clear. Even if class is “optional” (intentionally put in quotes!), you should really go.
Throughout college, you’ll be tempted to skip class or lectures. You may even be tempted to skip a discussion section once in a while. You may think “it won’t affect my grade!” or “I can catch up on that content later…” However, it’s important that you actually go to class.