My first day in a Linux admin and security course. I went all confident and cocky waiting for some bullshit like "type in your term: ls, cd, pwd, see you tomorrow"
Suddenly the teacher starts to configure lampp, then jumps to bind, and thirty minutes leater , when everyone has their ssl keys under control, I was still struggling to correctly forward my mate. The rest of the day was smooth and easy for those who finished their servers, and there I was, unable to find my own ass in the middle of that mess made of bad assigned permissions and wrong placed addresses. Even worse, he came to me when I asked for help, took my chair and fixed everything in one beautiful single bash line. I started to ask "what's this? Where is that? Is it a config file or a directory?" And with all his patience he keep telling me the obvious answers that where right there at the screen but I couldn't see. Took me two weeks to catch his pace, and another two weeks to understand fully his classes. He never said a word about my terrible first day (first couple weeks). When course finished, I saw he was going to teach a really hard security module, and I signed up without hesitate.