"Semantic web for the working ontologist" by Dean Allemang and James Hendler might be a good starter if you want to go proper Rdf/RDFS/OWL. TBH I would probabl

"Semantic web for the working ontologist" by Dean Allemang and James Hendler might be a good starter if you want to go proper Rdf/RDFS/OWL. TBH I would probably take a look at terminusDB though. They do things a bit differently, and are def. more opinionated (more closed world, more databasey) but that opinionatedness helps provide a bit saner/stable foundation than the very grown rest of the ecosystem imho.