I learned so much through trial by fire. The entire team worked a significant amount of overtime on a regular basis. Mfg runs 24/7 so engineers are often required to work early/late/overnight to support and train. My manager was mean to me in ways I've never experienced elsewhere, he just seemed to hate me from the start. It was never acceptable to ask questions, which is so weird in an engineering setting. I struggled to get any vacation approved even with months of notice and planning around projects. His toxic behaviour was completely supported and probably influenced by the even more toxic upper upper management.