Sometimes there are multiple enhancement spots and BAdIs available, and I am not sure which one should be implemented. I would also like to understand the best practices for debugging and testing a BAdI implementation.

Please help with the following points:

• What is a BAdI and how is it different from User Exits, Customer Exits, and Enhancement Points?
• How can we find the correct BAdI for a transaction or SAP standard program?
• Which tools can be used to identify a BAdI, such as SE18, SE19, SAT, ST05, and the ABAP Debugger?
• How can we create and activate a BAdI implementation?
• What is the difference between single-use and multiple-use BAdIs?
• How can we pass data between the standard program and the BAdI implementation?
• How can we debug a BAdI implementation to verify that it is being called?
• What are the common reasons why a BAdI implementation is not triggered?
• What are the best practices for implementing BAdIs in SAP S/4HANA projects?
• Can someone share a complete working example of finding, implementing, and testing a BAdI?

A beginner-friendly explanation with screenshots, ABAP code examples, debugging tips, and a real project scenario would be very helpful.