Oval C class+ what do I need to know?

Really stepped up my game and have become very good at ARCA having reached 2.1k and still rising fast. This week I have even been competitive in 3k Sof top splits. Probably wont stop racing ARCA but I want to explore what else the oval has to offer. As a Norwegian witch have only had a interest in motorsport since 2021 I know very little about oval racing and have until now only raced it on the side in my 1.5 years in iRacing.

I want start with the Trucks since I only have a C licence for now (4.57 so will be promoted to B quickly). I understand that things get a bit more complicated with safteycars, yellow flags and pitstops (have som experience with that from IMSA series). Having only driven street stocks and mostly ARCA, what do I need to know when doing races in C class and what will change again when I move up to B and A?