Advice for a new student. What to study before my Intro to Networking and Intro to Network Security classes start in the spring?

I am currently studying for the A+ exam, and I am signed up for two classes this coming spring. What do you wish you knew going into the start of your classes?

I am very green, so I am still trying to wrap my head around a lot of the acronyms and common terms. I want to be prepared going into class, so if you have any advice I would greatly appreciate it!