I don't know I'm the best at anything, per se. If I were to ask what I'm best at, as in, what I myself am best at, personally, compared against myself. Maybe Souls-likes? I've beaten all the Dark Souls, Elden Ring, Bloodborne, and at least half a dozen other Souls-like games.
But there's a girl who has beaten Dark Souls with a dance mat, so I'm far from the best overall.