Acquiring knowledge is one thing, and taking a Mentor is different thing.
But lots of HR books available. When you are in the HR and have a responsibility, then forget all the Media wastage of time, and go into a Library and get books and study day in and day out and scribble your points and book name and page number in you spiral note book.
Attend a lecture by a Mentor but how to cook is your ability.
Recently I saw a Video a person is making coffee and after poring coffee and water he is adding milk in such a way that there appears a nice flour on top.
When the lady who is learning watching him.
Then he tells her to do it.
She excellently made a lots of petal roses where as the Mentor did only a few petals of the flower.
So learning is your ability.