5G NR UE side RF Analysis for Log Code and L3 messages, as per 3GPP

Guys,
Where is the best place to find materials to learn 5G NR UE side RF Analysis for Log Code and L3 messages, as per 3GPP?

SharetechNote, TechnoPlay, LTE Stuf, Work Matlab… these sites have good public material.
(You can find these and a lot more in Community’s Favorites Favorites).