Most Kursbücher have a corresponding Arbeitsbuch (Workbook). While the Kursbuch introduces new concepts, the Arbeitsbuch is where you practice them. Never skip the homework sections.
A: The Kursbuch (coursebook) presents new topics, grammar explanations, and reading/listening texts. The Arbeitsbuch (workbook) contains exercises for practicing and consolidating the material covered in the Kursbuch. Ideally, you use both, but a dedicated learner can substitute the Arbeitsbuch with online exercises from the publisher's website. kursbuch b1 pdf
Explicit phrases ( Redemittel ) to help you express opinions, clear up misunderstandings, and negotiate. Most Kursbücher have a corresponding Arbeitsbuch (Workbook)