Quick recap
A year later, Hiccup is chief and Berk has become a refuge for rescued dragons, so many the island can't hold them. Warlords hire Grimmel, a hunter who wiped out the Night Furies and wants Toothless. He uses a white female dragon as bait, and Toothless falls for her. Hiccup decides to lead everyone to the Hidden World, the dragons' ancestral home at the edge of the map, and the village moves to a new island. Grimmel captures the dragons, but Hiccup and Toothless beat him in the air. Hiccup realizes dragons will only be safe away from humans and lets Toothless go. He and Astrid marry. Years later, they bring their children to meet Toothless again.
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