You're going to be warehoused with a bunch of lunitics.
You'll be caged with one or more of them (usually one) for the majority of the day depending on where you're at and what your security level is in between going to the cafeteria to eat and going to the yard for recess.
Be ready to shit infront of other dudes, and know that as soon as your shit hits the water that it's common courtesy to flush before your celly has to smell your shit.
And thoroughly clean that toilet after use too. It's not like the holding cells where everything is covered in shit.
Also be prepared for middle school politics on a grown up level.
Niggas who got beat up in middle school, suck dick and/or get stabbed in prison.
Basically just pretend that you're in middle school, but with grown ass men who know how to make knives out of anything.