To know the ropes means to understand all the details.
1. Within a short span of time, the young scout knew the ropes of putting up and dismantling a tent.
2. A member has to know the ropes about the various ISC sections before beginning contributions to the site. Hence it is best to first read the instructions on How to proceed at ISC.
3. Unless one knows the ropes of white water rafting, it can be a dangerous sport.