Yes, and this is where the effect is largest. Someone leading for the first time has no routine to fall back on and otherwise practices on their own people.
The typical situations of the first months exist as separate challenges: establishing authority with former peers, holding your ground with an employee who knows the subject better than you, giving critical feedback for the first time without apologizing for it.
For companies, this is the onboarding case: instead of throwing a new leader in at the deep end, they run through a series of practice conversations covering exactly the situations that are coming.
The practical entry point is a conversation you have in the next two weeks, not a foundations course.