Career Lessons Learned From Internship

What are the lessons you actually got to learn during your intern period or maybe your very first programming job?

What did I learn?

I actually got to learn was when you get stuck on a problem and you have no freaking idea to solve it whatsoever, just ask one of your senior. And don't just nod your head like you understand, but make yourself clear with the problem and get your art delivered. ;)