I know lots of languages already so when I go to learn a new language I dont buy concepts books I buy reference book for the language. I use the reference book to learn all the syntax and basic structure. I learn a few things about it like does it support recursion, what are references and what is not. Pretty much the internal structure of how the compiler works. Then I program and use the reference books when I dont know the syntax for something.
PS: They making you learn Cobol? You have my regrets that a really un-fun language to learn.