Players on £50k a week or more that say they don’t know the hand ball rule. It’s kind of like your job mate. Read the rules or ask someone to explain it to you if you’re really that thick.
UEFA referee committee puts out sets of video clips from UEFA Competitions twice a year with hundreds of examples of exactly what refs are being trained to call.
I watch them as an American ref. I imagine the teams could easily get use out of them if they wanted.