关于下面一段话的语法问题?看看有错误没,请指出,

关于下面一段话的语法问题?看看有错误没,请指出,
I think a good leader should be knowledgeable that is to make sure he/she can use the knowledge gained from the books put into a real world practice.This will help a leader to do works more efficiently.In addition,a good leader should be a wonderful communicator.He/she must concern about everyone.Furthermore,he can give specific instructions to the people who may need them.Finally,Have a vision is another important quality for a good leader.That means he/she has ability to see the chance then seize the chance.Refreshing ideas and changing the old method,then leading all the people to a new position