Reading one book on a subject can be life changing.

Reading several on the same topic can make you knowledgeable about it.

Reading fifty or more can turn you into an expert, having everything you know about it sink in.

This applies to non-fiction and fiction.

The more you read, the more you’ll understand about other people in the world. Reading is the easiest way to absorb another person’s life into your own without having to seek them out directly.