Everything You Need to Know About Custom Taxonomies | by Elyssa Respaut | Medium
MB Custom Post Types & Custom Taxonomies - Meta Box Documentation
GitHub - helgatheviking/Radio-Buttons-for-Taxonomies: Turn any WordPress taxonomy into a list of radio buttons, which forces users to select only 1 term!
Change quick edit terms list to radio buttons - WordPress Development Stack Exchange
Overview of Taxonomy form widgets - GovCMS Content Administration Manual
Radio Buttons for Taxonomies Vulnerabilities - Patchstack