I am working on a support and enhancement project where I need to understand how SAP standard programs work. I want to debug the standard SAP code to identify business logic, trace data flow, and find enhancement points without modifying any SAP standard objects.

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.