cut teeth on

cut (one's) teeth on (something)

To gain experience with something, especially at a young age (when one's teeth would be coming in). Oh, I cut my teeth on those kinds of equations! Give me a challenging problem for a change! Jen may be young, but she cut her teeth on academic writing, so her perspective and expertise will be invaluable to us.
See also: cut, on, teeth

cut (one's) teeth on

To learn or do as a beginner or at the start of one's career.
See also: cut, on, teeth