How many mistakes before you’re fired? (AUS)

I’ve messed up doing the patties during my trainings, then I messed up again, putting onions on accident when it was supposed to be plain patties-

I’m worried cause I’ve been messing up a lot unintentionally but I always try my best and I always ask for help, I ask questions

and I was wondering how bad do you have to be for you to get fired??