know the ropes可不是“知道绳索”，引申为懂行，懂得诀窍，懂行，在行，熟悉技巧。

【例句】
After two years in college, I think I finally know the ropes.
进了大学二年了，我想我终于懂得诀窍了。

The moment she got to know the ropes, there was no stopping her.
一旦她懂行了，就什么也难不住她了。