Funktionen Grundlagen
video1
https://drive.google.com/file/d/1EKLa3cKbYitOJjufYNGLicVkX4cIvuZF/view?usp=drive_web
video2
https://drive.google.com/file/d/162LX6LXdKdufcAdckEGpnK8j6oFdnQd_/view?usp=drive_web