well i just watched those videos (thanks by the way very helpful)
just a couple things that i need help understanding,
1: when in a car does my firearm have to be in a locked case? or can i leave it on my hip?
No law prohibits having a firearm in a car. The laws are exactly the same if you're in a car or on foot.
2: it is legal to cover up the serial code as shown in the video right?
Maybe. While I believe it is not illegal, I strongly believe some DAs will prosecute anyway. I'm not personally willing to risk being the test case. You would have to weigh the risks yourself and decide if SN-covering is above your own risk-aversion threshold.
3: is there any other places i can not be at while OCing?
Several... "Gun Free School Zones", College/university campuses/buildings, public buildings (read PC 171b, et al), federal buildings (post office, et al). I think I got them all...
Oh, and check local ordinances. Localities can regulate the possession of firearms on land the locality owns/controls (e.g. county fairgrounds). Some localities also have general prohibitions on possession in public places, but these prohibitions are preempted by state law, and are unenforceable. (Though some DA may try prosecuting anyhow -- refer to above risk-aversion rant.)