What it means
Means getting to grips with a new job, hobby, or any unfamiliar setup. You hear it when someone’s still figuring out the basics and where everything is. It comes from sailing, where green crew literally had to learn which rope controlled which bit of the ship. Handy phrase, slightly patronising if you say it with a smirk.
Usage examples
"He started at the new gaff on Monday and he's already stressing. Told him relax, he's just learning the ropes, he'll be sound by payday."
"Give it a fortnight and you'll have learned the ropes, everyone struggles at first."
"First week in the office and she's still learning the ropes, so maybe don't dump the whole circus on her yet."
"I know you wanna look slick on day one, but chill, man, you're just learning the ropes."
"Don't flap, bro, it's your first week. You're still learning the ropes, not auditioning to run the whole place."
Where it comes from
It does come from sailing, properly old-school. On a rigged ship, the ropes all did different jobs, so a new sailor had to learn which line worked what or they'd slow the whole show down. That literal shipboard training got carried into everyday English for picking up the basics anywhere new.