The roles in Peking opera are differentiated into fixed character types. There are 4 major roles: 生sheng (male role), 旦dan (female role), 净jing (painted faces), and 丑chou (male clowns). In detail,
The sheng 生 is the main male role in Peking opera.
The dan 旦 refers to any female role in Peking opera.
The jing 净 is a painted face male role.
The chou 丑 is a male clown role.
Here is a short video
There is also an excellent movie “霸王别姬 ” directed by Yige Chen. It is a great movie to understand how hard the apprenticeship went through to become main performers in Beijing Opera. This is a fantastic movie for older students.