In Jack Sparrow's origin story, the most crucial elements are his family connection to piracy. His father's status as a pirate was the starting point. Then, his early voyages on various ships where he learned essential skills like navigation and combat. His encounters with different pirates, some of whom became his mentors or enemies, also played a major role in shaping him into the character we know.
One key element is his pirate family background. His father's influence was significant. Another is his early experiences on ships which taught him about sailing. Also, the interactions with other pirates in his youth were important.