King Robert Baratheon visits Winterfell to ask Ned Stark to be his "Hand of the King" ( Rotten Tomatoes ).
Luffy defeats Alvida, frees Koby, and sets off to find Roronoa Zoro (One Piece Wiki). [S1E1] Episode One
The long-running series begins with Monkey D. Luffy setting out to sea. The One Piece Wiki tracks the early lore. King Robert Baratheon visits Winterfell to ask Ned
Because you didn't specify a series, I've broken down the key "useful content" from the first episodes of some of the most popular shows. 🐺 Yellowstone: "Daybreak" [S1E1] Episode One
This episode introduces the Dutton family and their fight to keep their massive ranch. IMDb (IMDb) provides a clear high-level summary of the pilot.