The Communist Manifesto remains an important foundational text. Many of the  arguments and criticisms are relevant today. I would recommend this to all. For socialists and communists, this is essential. Yet this is also essential reading for people with other political ideology who wish to critique communism, for they can only do so effectively by reading and understanding this manifesto.

For new readers of leftist literature, I highly recommend reading next "Feminism for the 99%: A manifesto," by Cinzia Arruzza, Nancy Fraser, and Tithi Bhattacharya. To me this is an essential, modern, updated, version of Marx and Engels' Manifesto.