Our second meeting of the year will generally be "Introduction to Shells". If you're joining us after that, please learn what a shell is and make sure you have a bash one on your computer.
Here are some other learning resources for getting started:
learn shell (good for starting): http://overthewire.org/wargames/bandit/
in-depth on general programming productivity tools: https://c4cs.github.io/#schedule pwn: http://pwnable.kr/
cryptography: Crypto 101 or CryptoPals
We run a CTF (learning competition) year-round here! Givet it a shot.