As an example I felt that RFC 1034 ("DOMAIN NAMES - CONCEPTS AND FACILITIES") [0] was well worth reading.
Which RFCs do you think most developers would benefit from reading through in their entirety (or close to)?
[0] https://www.rfc-editor.org/rfc/rfc1034
Seriously, once you get clarity and precision around these words, sloppy writing will make you cringe.
RFCs are about implementation specifics and details. Developers should be aware they exist, but don't waste your time until you need to implement or use something specific.
Better to spend your time getting a good general understanding of machine-code and assembler, compilers, network protocols, database mechanisms, etc. Then you'll be able to make sense of, and maybe implement, RFCs.
I've read lots of RFCs over the years and had too implement (too) many.