[META] Navigate through 3gpp's specifications

Hello guys,

Currently at my work, I must understand the 3gpp's 5G Core Network. Since my background was not in telecom, I have a hard time to find information among the sea of specification. From your experience, could you mind sharing with me some of your tips to navigate through those documents? I imagine that there exists some patterns when you need some information specific for example SMF/UPF and their protocols, I could find the related documents and section quickly.
P/s: I am not familiar with all terms in telecom. And the search engine on 3gpp's portal is not great or maybe I doesn't know how to pick the right query.