You can't learn a quality. You either come by it naturally, or you do a really good job of faking it. But j.lupo is correct that one can't learn leadership.
My own definition of great leadership is quite simple. A great leader is someone whose people will follow him or her off a cliff, no questions asked.
There are great managers who are lousy leaders, just as there are great leaders who are lousy managers. I like to think of management as tactics and leadership as strategy, and it's very rare to find someone who excels at both. If you have the great good fortune to do so, work for that person for the rest of your life. Life will be a breeze.
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