Expecting to learn what is legally required can leave you learning just the basics your state requires. I don't honestly think the minimums are what anyone should have as their end goal.
You should know your weapon and already have it's manual of arms. Shot it some, too. New owners deserve better than to be snickered at by others at a qualification, and shouldn't endanger the money for the class by failing to know how to load and shoot.
An awareness of your peculiar state's interpretations and no-go areas is valuable. It's not just a list of what bars to avoid - but what times, places, streets, etc., right in your community. Be aware what neighborhoods have drug dealers, drive by shootings, and strong arm break-ins. Without a significant reason to be there, you are just cruising for victims to shoot. Ask any DA.
Whch surrounding state's share reciprocity is need to know information. You don't want to ruin a quiet trip with a wrong assumption.
Learning how much more a CCW licensee has to accept in the way of insults, because they are required to back down, and prevent escalation. Provocation and brandishing a firearm are two fast ways to lose the license or worse.
A read through Massad Ayoob's In The Gravest Extreme, and other books he's written on the subject. It's good clear writing with no sales pitches for the latest equipment or technique - it clearly explains when and why you can't shoot as much as can.
I got my CCW after 22 years in the Army Reserves and holding a MP MOS mobilized. Much of the CCW was a good refresher - and at the pace information is presented in a one day class, someone learning things new really needs more repetition. Having some of the above already familiar and known leaves you time to listen for what you don't - which is more and better training, and what you are paying for.
Those who read up ahead benefit from a better education. Then you can smile with some quiet knowledge at the macho blowhards reciting wrong information and poor tactics.
The unpleasant truth is that if the gun needs to come out, the round should hit the perp within seconds. The decision that life was in danger and someone needed to be stopped should occur before the gun is touched. It's not like on TV at all.
CCW isn't a one time test, it's a lifelong accumulation of new habits and knowledge, which never ceases to provide new lessons. It's also an immense responsibility in the application - and where you never want to be wrong.
"Ooops" won't fix it.