First Steps in SAP ABAP
172 pages, 2nd edition published at Espresso Tutorials in April 2023 https://www.espresso-tutorials.de/produkt/first-steps-in-sap-abap-2nd-edition/
- Getting Started with ABAP
- Using ABAP Statements
- Using the ABAP Workbench
- Using data types from ABAP Data Dictionary (DDIC)
- Modularization and reusing functionality
- Accessing the database
- ABAP User Interface Technologies
- Introducing the ABAP Development Tools
- Conclusion
Interface development in SAP ABAP Part 1: classical interfaces
240 pages, published at Espresso Tutorials in July 2028 https://espresso-tutorials.com/Programming_0132.php
- Overview on classical ABAP Interface technologies
- Using Remote Function Call (RFC)
- IDocs and ALE
- RFM and BAPIs in SAP S/4HANA
Migrating to SAP S/4HANA
Third edition was published in January 2024: https://www.sap-press.com/migrating-to-sap-s4hana_5816/
English 
German