Clarity regarding controlled vocabularies, taxonomies, thesauri, ontologies, and metamodels. With all the scuttlebut going around about folksonomies and tagging, these are important terms to understand. In the process of tagging, it's pretty noticeable
L. Ehrlinger, J. Schrott, and W. Wöß. Database and Expert Systems Applications - DEXA 2023 Workshops, page 3--10. Cham, Springer Nature Switzerland, (2023)