For most HN readers, learning COBOL syntax and conventions would be a trivial task. If you want to be productive in a corporate mainframe environment, you will

For most HN readers, learning COBOL syntax and conventions would be a trivial task. If you want to be productive in a corporate mainframe environment, you will also need to get up to speed on operating system APIs, file systems, database interfaces, user libraries, and probably much more. Then you can start learning the business logic of your employer's applications. During your training, don't bother trying to find answers to your questions on Stack Overflow or examples on GitHub. Not much fun.