Show Vocabulary Crash Cours for my Assistant

[Y2Hood]

I've got a buddy who's cosigned a large number of his son's TCG cards through me for shows. The so wants nothing to do with him as he's got f u money in his adult job.

Buddy's tagging along next show because he feels bad about me doing all the work and I'm super excited for him to see the wonderful world of the trading card show world.

I also need to prepare him for bad actors. As the TCG are mostly his, I'm letting him know what it cost to grade the graded ones so he'll know from there how much wiggle room is in it for him. I've told him about the term "comps" and if someone wanders off to "comp" a card it means they're going check recent ebay sales and aren't shoplifting. What's some other key crash course terms I need to compile for him in case I go get a hot dog or use the facilities and have to leave him unattended? He's super nice and only sees the good in people so I'm dealing with the personification of "wears a sign and then gets targeted by scammer" level of wholesome with this guy.