LAS VEGAS — This rookie season rightfully could have been titled, “The Education of Matthew Schaefer.”

Certainly there are lots of lessons for him to learn in the months ahead, but for now, the curriculum has changed.

The Islanders’ 18-year-old defenseman has been the one doing the schooling — throughout the East and now in the West.

Schaefer’s power-play snap shot from 51 feet out eluded Vegas goalie Akira Schmid with 2:01 to go in the first period to give the Islanders a two-goal lead en route to their 4-3 victory overtime over the Golden Knights at T-Mobile Arena.

He later assisted on Mathew Barzal’s one-timer shot with 2:37 to go in the third period to tie the game at 3 after Vegas had rallied for three goals in less than 12 minutes to take a 3-2 lead.

The Islanders notched the wi

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