sth. one knows well and can manage with ease
It's a Chinese idiom. Pinyin is Q à ngch à sh ú D à o, which means to do something familiar and easy. From xufanting's Moganshan.
Idiom explanation
I am familiar with something and can do it easily.
The origin of Idioms
Xu Fanting's "Mogan mountain" says, "I'm familiar with the way to find autumn, and I'll go to Lin'an with my friends in the afternoon."
Idiom usage
It is easy to do things
sth. one knows well and can manage with ease
in the most congenial surroundings - jiāo lóng dé shuǐ
be jealous of the good and envious of the strong - jí xián dù néng