If you are new to the medium, these are the "gateway" shows that have universally high approval ratings. Death Note
Perhaps you think anime is just for kids. You couldn't be more wrong. The following are designed to break your brain and mend it back together.
Many popular series begin as manga. If you finish an anime and want more, the manga is almost always the next step. For ongoing anime like Solo Leveling (manhwa) or Frieren , the source material is often superior in pacing and detail.