What are the qualities that makes Ralph a good leader? How does the writer reveal these qualities to the readers?
Ralph is a good leader because of his physical prowess, his confidence and readiness to act that this produces, and his ease with people. He's also good in part because he doesn't get caught up with theory or questions the way Piggy does, and is not, at the start of the book, subject to fears or anxieties.
The author shows this in two ways: through showing him in action demonstrating these qualities, and through showing how others (such as Piggy) react to him.
check Approved by eNotes Editorial
The qualities that makes Ralph a good leader is his maturity and leadership skills.
The writer, William Golding, doesn't straight out mention the good qualities of Ralph, but the author creates Ralph's personality by his actions.
For example, whenever the other boys were laughing and snickering at Piggy. Ralph stood still and didn't laugh with them, which shows his maturity.
Another example is that he always lead the group and made sure the fire kept on going because he knew that that was the most important for saving everyone.