>>212993109One Piece is usually pretty good for casual people. Just don't mention the length or say you're only watching the original few arcs. It's really good at keeping you engaged early on.
Other than that, you have the usual classics, but it's really up to taste. Anime isn't really a genre as much as a medium. There are vast differences to point where asking for an anime recommendation is like asking for a movie recommendation with zero context. Could be comedy, romance, sci fi, action, adventure, too wide a spectrum for recommendations without context.