Want to be easy to understand, it is best to Cheng Junying's The Book of Songs, Shanghai Ancient Books Publishing House. There are notes and vernacular translations, which are valuable for collection. Mr. Cheng Junying is not very satisfied with his annotation of The Book of Songs, because poetry is untranslatable, and the meaning of the translated poem is easy to convey, but the charm will be lost.

Want to further study, it is best to Cheng Junying, Jiang Jianyuan's Notes on the Book of Songs, Zhonghua Book Company. There are very detailed notes, and there is no vernacular translation. This edition has been included in the Basic Series of China Classical Literature by Zhonghua Book Company, which is very valuable.

The more common version is The Book of Songs by Zhou and Zhou, which was published by Zhonghua Book Company. Personally, I think Cheng Junying's version is better.

In addition, there is the annotation of the Book of Songs, which was published by Shanghai Ancient Books Publishing House. This book is ideological, so I suggest you forget it.