Demon Slayer, Chainsaw Man, Jujutsu Kaisen are a must for newer anime.
Inuyasha, Death Note, Fullmetal Alchemist: Brotherhood are the tops for older anime that don't have an insane amount of episodes. Inuyasha being the longest though but it goes quick.
If you like animal related Wolfs Rain, Ginga Densetsu Weed & Ginga Nagareboshi Gin are really good.