how to become a manager

“If you’re not happy, it’s best that you leave as early as now.”, the supervisor said. He handles the transition team. Trainees need to undergo two weeks of transition before they get endorsed to the real world. The production. The trainer said something to him and he corrected himself (the supervisor) right away. He clarified what he meant, but I didn’t listen because for me, anything that comes out of his mouth is trash. I almost took my bag and fucking left the place, only I realized I needed a job and we haven’t gotten our first pay yet.