Query on CDS Views and AMDPs

Hello,

I have few basic questions on CDS views and AMDPs:

1. How do we identify the potential candidates in existing code where CDS views or AMDPs can/should be used for code-push down? Are there any recommendations?

2. Should CDS views or AMDPs be used only for cases where we have data intensive calculations or they can be used as alternative to performance optimization techniques like to replace scenarios where multiple SELECTs or JOINs are used etc.?

3. A CDS view internally can also contains a SELECT statement with JOINs. How does this help improve performance? I can just write the same SELECT in a CDS view and it will improve performance because the processing is at DB level? Is that a valid argument?

Best Regards,

Mohit