Aristotle is one of my favorite philosophers, so it goes without saying that his Nicomachean Ethics are one of my favorite pieces of philosophical literature. For anyone interested in philosophy, specifically an overview of how to live ethically, this is a great introductory book to read. The book touches on happiness, pleasure, justice, virtue, and friendship.
I have read this piece before, but this is the first time reading the Oxford Classics translation which is pretty palatable. However, since it is a piece of Aristotle one shouldn’t expect to be able to quickly run through this. This book is best enjoyed taking your time, reading each chapter (or “Book”) one at a time at your own pace. (If it helps, use a secondary source while reading if particular parts seem confusing).