This is the 745th most frequent Chinese word.
丰富
Rich; abundant; plentiful.
丰富 is used here to describe the variety or abundance of the content in the book.
这本书的内容非常丰富。
The content of this book is very rich.
丰富 is used here to describe the wealth or depth of his work experience.
他拥有一段丰富的工作经验。
He has a rich work experience.
丰富 is used here as an action to indicate enhancing or expanding our knowledge.