Yes, the ending of Thor: Ragnarok once again drops a post-credit stinger on to rabid Marvel fans, but for the most part, the movie -- director Taika Waititi’s first entry into the "Marvel Cinematic Universe," the third entry in the trilogy of Thor-led films, and the seventeenth film in the greater interconnected Avengers series -- takes a totally different direction than its predecessors. Ragnarok recalls the days of standalone adventuring. As Thor ventures from Asgard to Earth to Sakaar and back to his kingdom, he's rarely bogged down in setting up other films. Mostly.
The spaceship at the end of Ragnarok
The first of Thor 3's two end credits scenes finds Thor and Loki staring out over space, on their way to Earth with the last survivors of Asgard. The sweet moment is interrupted (or intercepted) by a large ship, multiple sizes bigger than their own, looking like it’s ready to swallow them up like a Star Destroyer swallows Tantive IV in the original Star Wars. Deductive reasoning suggests this is the ship of Thanos and The Black Order, the primary villains of Avengers: Infinity War (and presumably the untitled Avengers 4, slated for 2019).