"What the Buddha Taught" by Walpola Rahula is an extremely good book. It limits itself only to direct teachings of Buddha, and it explains the core concepts an

"What the Buddha Taught" by Walpola Rahula is an extremely good book. It limits itself only to direct teachings of Buddha, and it explains the core concepts and teachings of Buddhism by explaining everything simply. The author is a revered scholar and his style of writing is excellent.