Summary: Custom fields in WordPress enhance user profiles beyond basic info, enabling tailored data collection via methods like Advanced Custom Fields (ACF), custom coding, or WPForms integration. ACF is recommended for ease of use, offering features like conditional logic and a variety of field types. Best practices include ensuring data privacy, user-friendly forms, and proper data handling. Implementing custom fields improves user experience and allows for personalized content, facilitating better engagement and marketing opportunities.
https://www.advancedcustomfields.com/blog/wordpress-user-custom-fields/