It's kind of a mixed bag. Some aspects of Thor's character and story in Ragnarok are true to the comics, but there are also significant changes and creative liberties taken.
The movie Thor: Ragnarok draws its roots from the Marvel Thor comics. It weaves together elements from different comic issues to bring the story to the big screen. The comic influence is evident in the characters, settings, and overall plot of the movie.
The back story in the Thor Ragnarok trailer shows that Thor is facing a great threat to Asgard. Hela, the goddess of death, has emerged and is bent on destruction. Thor has been away and returns to find his world in chaos. He has to fight not only Hela but also deal with being stranded on the planet Sakaar. This sets the stage for an epic battle to save Asgard and its people.
Friendship is also a big theme. Thor's relationships with characters like Hulk and Valkyrie are explored more deeply. In some fan fictions, they form even stronger bonds as they face new challenges together. There's also the theme of discovery. As Thor travels the universe, he discovers new cultures and powers, which is a popular aspect in fan fiction.