Rookie seasons in the NFL are almost always full of bumps, bruises, mistakes and welcome-to-the-league moments.

RJ Harvey ’s had his share.

The Broncos’ second-round running back made a mistake on a kick return last week.

He’s whiffed in pass protection a couple of times.

He’s been tasked with finding rhythm in games despite seeing limited reps behind Denver starter J.K. Dobbins.

The key is how quickly young guys can learn.

The No. 60 overall pick out of Central Florida made one adjustment in particular Sunday that had All-Pro right guard Quinn Meinerz cracking a wide smile.

“I’d say his biggest growth is he actually celebrated today,” Meinerz said. “I gave him a little bit of a hard time — his first (career) touchdown, he just kind of stood there. I was like, ‘Dude, we’ve got to

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