Repetitions (Reps) = The amount of times you lift the weight in any exercise, commonly there are be 8-12 reps in one set
Sets = A set consists of a certain amount of repetitions (reps), usually you will to 3 working sets of each exercise + min. 2 sets of warm-up (depending on how heavy you are lifting)
Superset = Like a set, but your are doing exercises back to back without rest. After the superset, you get to rest, then do it again. Usually, exercises are combined that target different muscles. This is a very efficient way to shorten workout time, at the cost of increase intensity.
AMREP = As Many Reps As Possible - go as many reps as you can, just before muscle failure, write down your number, beat it next time
Rest = the time you get to pause between sets, don’t sit down, stay on your feet
RPE = Relative Perceived Effort, one day squatting 200lbs might seem like 8/10 effort (RPE 8), then next day it might seem only like 6/10 (RPE 6), generally you want to be at below RPE 5 when warming up, and for work sets you want to be at RPE 5-9
PR = Personal Record, you try each workout to set new PRs for all your major lifts
BW = Bodyweight, an exercise done without any extra weight
UB = Upper body
LB = Lower body
DB = Dumbbell
BB = Barbell