[qiào mén]
key (to a problem); know-how; knack; secret of success; skilful method
know the ropes
懂得竅門(mén)
learn the tricks of
學(xué)習(xí) ... 的竅門(mén)
try to find the key to a problem; try to get the knack of doing sth.
找竅門(mén)
There's a knack in it.
這里面有點(diǎn)竅門(mén)。