I really enjoy Steven King’s work. He has an engaging style and some great, often spooky ideas.
He doesn’t plan his stories out; he just writes and lets the story flow, essentially shooting from the hip. Sometimes this works out great, other times he winds up resolving things with a deus ex machina. Generally you aren’t reading his books for the ending, but rather the journey. His short stories tend to avoid this issue - it’s much harder to write yourself into a corner when the story isn’t that long.
The best introduction to King is probably his first novel, “Carrie.” Some of it is now cliche or standard tropes, but that’s just because of how impactful this book was. “Firestarter” is another great introduction.
“Fairy Tale” is good but it’s not King’s best work. It has some of his classic tropes I really like, such as portals to alternate worlds, and thematic similarities to classic literature (in this case, fairy tales). But it’s also a bit drawn out in parts. I periodically reread some of Stephen King’s books, this probably won’t be one of them.
An alternative King story that has similar themes that I’d highly recommend instead is “The Talisman”, which was cowritten by Steven King and Peter Straub.