learn the ropes

verb2

1. •
   (informal) To learn the basics or master introductory knowledge.

   • Work slowly and cautiously until you have learned the ropes.
2. •
   (informal) To learn some skill requiring specialist knowledge.

   • Yet for nearly ten years [Bill] Kenwright refused to speak to his nephew after Adam, who learned the ropes of theatre production from his uncle, decided to go it alone. — 2008