Loyalty.
Team players.
If you don't have that, Fear sometimes works, but you have to sleep light.
Loyalty is best, as it keeps you from losing sleep and getting ulcers, etc.
the leader of a pirate crew was called the captain
That would be Mary Read, and it's Jack Rackham's pirate crew.
John Rackham was an English pirate who sailed in the Caribbean during the Golden Age of Piracy from the years 1650 to 1725. The names of John's female pirate crew are Anne Bonny and Mary Read.
Quartermaster
No such records were made or kept.
Bartholomew Roberts was forced in to becoming a pirate ny his own crew . He was a great sailor so ther kidnapped him and miade him into a pirate.
Pirate captains were usually a man with a ship who gathered a crew of men who volunteered in extchange for payment
Two female pirates were part of John Rackham's pirate crew. Anne Bonny and Mary Read
Anne Bonny and......
He was never a StrawHat Pirate.
One of the things she did was kill her own crew of pirates and burn their ship.
Skipper isn't necessarily pirate slang as much as generally nautical slang: It means the captain or leader of the crew.