V would like to introduce you to two excellent German grammar books, including:

1) Deutsche Grammatik – einfach, kompakt und übersichtlich

This is a reference book for teenagers or those learning German as a foreign language, and it has been a bestseller on Amazon for many years.

This book presents grammatical principles clearly and understandably, along with how to use those structures in everyday speech. It is also considered a book that explains grammar in an easy-to-understand way.