Most importantly: ask questions.
Within your team, within your company, everywhere you get a chance. I cannot count how many problems stemmed from mine and other people's assumptions, miscommunication or avoidance of appearing to be dumb or incapable.
If anyone feels they'd hurt their career or relationships with management and peers by doing so, then that sounds like quite a hostile place to work at. My advice would be to get a mentor outside of that company, or, better yet, find another company to work for.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.