Demon Slayer has cemented its place as a modern shonen classic, a hugely popular manga/anime franchise brought to life by author Koyoharu Gotouge's vibrant imagination. Even if Demon Slayer is relatively short and straightforward compared to its shonen forebears like One Piece and Dragon Ball Z, it still boasts a compelling, colorful world with a neat combat system and a great plot.
Source:https://www.cbr.com/demon-slayer-most-important-lore-for-new-viewers/