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Top rated philosophy books on Reddit rank no. 14
Where to start with Plato(r/askphilosophy)
I suggest picking up a copy of Plato: Five Dialogues. It’s pretty much the standard introduction to Plato in universities everywhere. They’re perhaps the easiest to read in comparison with the other dialogues, will give you a good idea of Plato’s methodology and core philosophical views, and collectively represent a good introduction to thinking philosophically. And a paperback copy is cheap and easy to find.