ERP ABAP content covers the fundamental principles of SAP’s Advanced Business Application Programming language and its application in building software for Enterprise Resource Planning (ERP) systems. Key areas include ABAP syntax, data types, and the ABAP Dictionary, as well as developing reports, interactive screens, and forms. More advanced topics involve modularization techniques, database interactions, and enhancements using technologies like RFCs, BAPIs, and ALE/IDocs.