As of now, there have been two seasons of Demon Slayer:

Demon Slayer is arguably the most significant anime phenomenon of the last decade. It is not a complex deconstruction of the shonen genre like Attack on Titan or Jujutsu Kaisen . Instead, it is a refinement. It takes the classic "boy fights monsters to save sister" trope and executes it with a level of polish that borders on unfair to its competitors.

The numbering of Demon Slayer seasons can be a little confusing because the first season was followed by a movie, which was then re-edited into a shorter season. Here is the correct viewing order:

(Optional if watching Season 2): The film Mugen Train was later re-edited into the first seven episodes of Season 2. Season 2 (Entertainment District) : Episodes 8–18. Season 3 (Swordsmith Village) : 11 episodes. Season 4 (Hashira Training) : 8 episodes. Future of the Series: The Infinity Castle Trilogy