看门道

Traditional (Taiwan): 看門道

kànméndao ㄎㄢˋ ㄇㄣˊ ˙ㄉㄠ

    • to understand the tricks and fine points of something
    • to know the ropes

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
look at the doorways
Meaning
To understand the tricks and fine points of something. Close to "see how it works" or "know the ropes".

Sources