The Portfolio German as a Second Language is a comprehensive teaching resource that serves as a valuable tool for reflecting on and developing one's teaching competencies. Written by authors Magdalena Michalak and Kirstin Ulrich, this book offers a structured approach to teaching the German language as a second language. With a paperback cover and 112 pages, it is both handy and informative. The content is written in German and is aimed at educators who wish to critically examine and optimize their methods and approaches in the field of German as a foreign language. The portfolio promotes self-reflection and supports teachers in identifying their individual strengths and areas for development. It is an indispensable tool for anyone involved in language instruction who wants to continuously improve their pedagogical skills. The book originates from Germany and was published in 2025, making it a current resource for educators.