cut one's teeth on

Idioms  

1. Also, cut one's eyeteeth on. Get one's first experience by doing, or learn early in life, as in I cut my teeth on this kind of layout or He cut his eyeteeth on magazine editing. This term alludes to the literal verb to cut teeth, meaning “to have teeth first emerge through a baby's gums,” a usage dating from the late 1600s.

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Example Sentences

This event spelled the doom of ITS and the technical cultures that had spawned the original Jargon File, but by mid-1991 it had become something of a badge of honorable old-timerhood among hackers to have cut one's teeth on a PDP-10.

From Project Gutenberg