Must Read:

I would like you to go through the Oracle 12c Golden Gate new features. Here are some of the best links for same:

• Oracle 12c Golden Gate new features

I would like you to go through different Data Types supported by Oracle Golden Gate and also some limitations. Here are some of the best links to read:

• Details of support for Oracle Data types
• Oracle Golden Gate Limitations and Restrictions

Here is Golden Gate compatibility matrix which you can use to check OS/DB level compatibility:

• Oracle Golden Gate compatibility matrix