I would like to learn the complete debugging process used by experienced ABAP developers.

Please help with the following points:

• How can we debug a standard SAP transaction without changing SAP standard code?
• What is the difference between session breakpoints, external breakpoints, and system debugging?
• How can we debug standard reports, module pool programs, function modules, classes, BAPIs, and Web Dynpro applications?
• How can we enable system debugging and when should it be used?
• How can we trace the execution flow to identify the exact method, function module, or class responsible for a business process?
• How can we debug RFC calls, update tasks, background jobs, and IDoc processing?
• Which transactions such as SAT, ST05, SM37, SM58, and ST22 are useful during debugging?
• How can we identify available BAdIs, enhancement spots, and user exits while debugging?
• What are the best practices to debug production issues safely in development or quality systems?
• Can someone share a complete real-time example of debugging a standard SAP transaction from start to finish?

A beginner-friendly explanation with screenshots, transaction codes, debugging tips, and practical project examples would be very helpful.

I know that breakpoints can be used, but I want to understand the complete debugging process in a simple and practical way.

For example, I want to know how to find why an internal table is empty, why a SELECT statement is not returning data, why an IF condition is not working, or why sy-subrc has an unexpected value.

Please help with the following points:

• How can we start debugging an ABAP report, function module, class method, BAdI, user exit, or enhancement?
• What is the difference between session breakpoint and external breakpoint?
• When should we use a breakpoint, watchpoint, or conditional breakpoint?
• How can we debug a background job, RFC call, update task, IDoc, or Web Dynpro application?
• How do we check variable values, internal tables, structures, field symbols, and references in the ABAP debugger?
• How can we identify why a SELECT statement returns no records?
• How can we use sy-subrc correctly while debugging?
• How can we skip code, change variable values temporarily, or move the execution pointer during debugging?
• What are the most useful debugger shortcuts and tips for beginners?
• What are common ABAP debugging mistakes and how can they be avoided?

A simple step-by-step explanation with real examples, screenshots, and common troubleshooting scenarios would be very helpful.