Hi @Ralf Baumgart , welcome to the Comunity. You will find Confluence documentation here and here is a section on creating and editing content. Hope that helps.
@Ralf Baumgart, we also made a tutorial series that might help you get going: https://youtube.com/playlist?list=PLVvtVyEIKNWh0VpvUfSsyO0e2kouNeC43&si=ExcFT_8cSZS5PrkZ
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