CHICAGO — Maybe it’s not the centers who have the steepest learning curve under new head coach Mike Brown.

Maybe it’s Josh Hart — the player being asked to sacrifice more than anyone else in Year 1 of the new regime in New York.

Hart is coming off a career year, one where he led the NBA in minutes per game and started all 77 appearances under Tom Thibodeau.

Now? His world looks different. His minutes have dipped from a league-leading 37.6 to the mid-to-high 20s. His starting spot — once a badge of honor — has been replaced by a defined role anchoring the second unit.

This is life under Brown. And while Hart remains a vital piece for a Knicks team with championship ambitions, his transition has been as complex as anyone’s. Karl-Anthony Towns and Guerschon Yabusele are still masterin

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