The term 101 (pronounced One-Oh-One) often indicates an introductory level of learning.
The term originates from use in American university course numbering systems, designed to make transfer between colleges easier. In theory, any numbered course in one institution should bring a student to the same standard as a similarly numbered course available elsewhere within the same state.[1]
The standard generally adopted was that the first number refers to the academic level, whilst the following numbers indicate particular speciality within the field of study. 101 is normally a general course at beginners' level.