Things you wished you had known before joining a company?

Sometimes when companies extend an offer, they don't really go through every single detail about the benefits, perks, company life, etc. Or sometimes you find out things about the company after you started working. What are some things you wished you had known before joining a company or officially accepting an offer?

Here are some examples to show the things I was referring to. They may or may not be applicable in the real world.
- company gives 100 hours of study time, but doesn't allow/strongly discourage people from taking more than 2 hours a day
- company actually has a limit to how much exam materials/seminars/fees they will pay per year
- company says they will give exam raises after each pass. However, you passed too many in one year and they end up not giving a performance raise
- people actually leave at 6:30 even though it's really a 9-5 job.
- first day/week of work was actually pretty challenging and tasks actually required skills you put on your resume
- PTOs are not as flexible as you think. Can't take vacations when senior co-workers are taking theirs during Christmas and someone needs to be in the office.


Things you wished you had known before joining a company?