Mastery

This is a big topic.

It's not

Mastery is defined as having comprehensive knowledge or skill in a subject. Comprehension is expressed as understanding all, or nearly all, elements or aspects of something. By these definitions, it is obvious that to become a master takes a great deal of time, effort and desire.

Reference: https://www.kforce.com/articles/how-to-become-a-master-of-your-craft/#:~:text=Mastery%20is%20defined%20as%20having,of%20time%2C%20effort%20and%20desire.