Tag 1:
Sharing GIS ressources online: https://doc.arcgis.com/de/arcgis-online/share-maps/supported-items.htm
Authoring operational content: https://doc.arcgis.com/de/arcgis-online/share-maps/hosted-web-layers.htm
Creating web apps: https://doc.arcgis.com/de/arcgis-online/create-maps/make-your-first-app.htm
Authoring basemap content: https://doc.arcgis.com/de/arcgis-online/share-maps/publish-tiles.htm
Tag 2:
Sharing image content: http://resources.arcgis.com/de/help/main/10.1/index.html#//01540000045v000000
Sharing analysis workflows http://resources.arcgis.com/de/help/main/10.1/index.html#/na/0154000004v5000000/
Allgemeine Hinweise:
Veröffentlichen von Services: http://resources.arcgis.com/de/help/main/10.1/index.html#/na/0154000002pp000000/
ArcGIS Online Referenz: https://doc.arcgis.com/de/arcgis-online/reference/whats-new.htm
Erste Schritte in ArcGIS Online: https://doc.arcgis.com/de/arcgis-online/reference/get-started.htm