There are many keys to be a great leader, but if you only have these three important keys, it is enough.
The first one is firm. You must be firm to show that you are so strong in doing something and do what you think it is right. The leaders are strongly felt and unlikely to change the goal. They never give up in achieving the goal. They never show their weakness to the team.
Second, the leader must be fair. They treat people equally without favoritism or discrimination. The great leader gives the equal opportunities to all people in his or her team. They solve any problem of people fairly.
Finally, the leader must be friendly. They like people and people will like them back. The great leader make people feel easy to work with them.
In summary, the great leader must be firm, fair, and friendly.