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Here is a synopsis of the movie written by John Steinbeck:

In the Salinas Valley, in and around World War I, Cal Trask feels he must compete against overwhelming odds with his brother Aron for the love of their father Adam. Cal is frustrated at every turn, from his reaction to the war, to how to get ahead in business and in life, to how to relate to estranged mother.

I think that saying the phrase "East of Eden" does not hold any meaning in American culture today.

its a book by John Steinbeck which I heard is pretty good

it's a book by John Steinbeck!

It's a good book and it's a good movie. That's just about it.