User Exits, Idoc, Enhancement Framework, Workflows, Abap Objects, Abap Oo, Dictionary, CDS view, SAPForms, SAP PI PO integration layer, Change document framework, Odata service, post upgrade activities, RFC’s, IDoc Queue handling, BADI’s, Conversions and Data load methods, ALE IDoc configuration, ABAP Proxy Framework, SPAU, ABAP development workbench, SPDD, Ale, error handling, Open-SQL performance tuning