Books, videos, forums, blogs, talking with friends/other poker players, websites, television...
Almost anything can be helpful. Some of the things you read/hear/watch will benefit your game greatly. It's a matter of retaining what is helpful and letting go of what isn't helpful. It can take some time to be able to filter through the information to determine the good from the bad.
For those new to poker, I'd recommend starting with some of the tried-and-true basics. Those have been proven out and are a good foundation.
Good luck!