A reading disorder is characterized by pronounced difficulties in reading accuracy and speed, as well as in reading comprehension. A spelling disorder manifests as an extraordinarily high number of spelling mistakes. Children and adolescents with a reading/spelling disorder (RSD) often try to hide their difficulties as best as they can. Many succeed in doing so for an extended period. If the disorders go unrecognized, academic overwhelm can lead to or exacerbate psychological issues. The guide provides information on the symptoms, causes, diagnostics, as well as prevention and support options for reading and/or spelling disorders. Parents, teachers, and educators receive concrete advice and guidance on how to address the issue within the family, kindergarten, and school. Prevention strategies in kindergarten are also discussed.