To watch One Piece in order, the best way is to follow the chronological order of the anime episodes starting from episode 1 and going onward sequentially. The anime follows the manga's chronological story arcs, so watching the episodes in their release order covers the main story properly. Here is a brief overview of the order:
- Begin with episode 1 and watch all episodes in sequence by their episode number.
- Movies and OVAs are mostly non-canon and can be watched anytime, but some are related to certain story arcs and can be watched after those specific episodes.
- Major sagas include the East Blue Saga, Arabasta Saga, Sky Island Saga, Water 7 Saga, Thriller Bark Saga, Summit War Saga, Whole Cake Island Saga, Wano Country Saga, and the ongoing Egghead Arc.
- There are also fillers, TV specials, and OVAs that can be optionally included.
- A recommended watch order for anime episodes with movies and OVAs interspersed can be found in detailed guides which list episodes and movies by arcs and their manga chapter equivalents.
This approach ensures the story flows coherently as intended by the creator Eiichiro Oda, and the best experience is following the TV episodes in sequence, adding movies/OVAs optionally based on interest[citation].
If needed, I can provide a detailed episode and movie watch order listing as well.