Find the personal name, family name, and author ID of the course author that teaches the most courses.
SELECT T1.personal_name ,  T1.family_name ,  T2.author_id FROM Course_Authors_and_Tutors AS T1 JOIN Courses AS T2 ON T1.author_id  =  T2.author_id GROUP BY T2.author_id ORDER BY COUNT(*) DESC LIMIT 1
most courses refers to MAX(COUNT(course_id)); personal name, family name, and author ID refers to selecting these specific fields from the database; teaches refers to the relationship between Course_Authors_and_Tutors and Courses, indicating a JOIN operation;