In Germany, approximately one billion euros are spent annually on tutoring. Many teachers at public schools also provide private tutoring on the side, generating additional income. A modern and future-oriented form of tutoring is online tutoring. This allows, for example, weaker students in their own classes to receive additional support, regardless of time and location. To provide professional online tutoring, one must be familiar with the most important online media, new learning methods, and online learning itself. This book can be used, among other things, for the professional development of teachers in the area of "online learning." It offers detailed information, practical implementation aids, and also general knowledge. How does online tutoring work in practice? What technical requirements are necessary? What special features are there?.