The Nets are about to embark on a season where the lottery is the goal and draft picks are the endgame. It’s a smart move, but a hard sell.

At least for today.

That’s part of why they’re playing the long game, with young rookies on the floor and young fans off it.

The Nets are aiming to cultivate generational fandom.

And the latest example of that came this week with the long-awaited opening of the Brooklyn Basketball Training Center, right across from Barclays Center.

For BSE Global — the parent company of the Nets, Liberty and Barclays Center — this building is key to building a young fan base.

“It’s huge,” BSE Global CEO Sam Zussman told The Post. “Then you’re a fan. Yeah, I mean, think about what made you a fan. Sometimes it’s the parents coming home, bringing a ball to someone,

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