Using OSX/macs

guys, can you enlighten me on what problems I’ll encounter going from windows to Mac? how do they work differently?

Here’s my situation, I’m going to start college doing audio stuff, and opted to miss out on the first part of the course(mainly some Flash, photoshop, dreamweaver, etc.). However, I know I’m going to be working on Macs when I start, which I haven’t used much since the days of tiny black&white screens. I don’t want to take too long to get to grips with the OS.

So therefore, please no opinions on OSX .v. windows, I just need to know practical differences I’ll have to deal with. Cheers.