Idioms: Learn the Ropes

Learn the ropes 

To understand how to do a particular job or activity. Learn the ropes stands for learning something new. It is originally a nautical term implying that new recruits had to learn how to tie knots first in order to become true sailors. 

Usage Notes:

Sometimes used in the forms know the ropes (to understand how something is done) and show someone the ropes or teach someone the ropes (to teach someone how something is done):

Example:

1. It'll take some time for the new receptionist to learn the ropes.
2. You'd better find someone to show you the ropes if you're going to fix the car yourself.  
3. This is a new position for him and he will need time to learn the ropes.  

Courtesy:
Free Dictionary, Thesaurus and Encyclopedia
Business Idioms & Phrases