Final answer:
The sentence emphasizes the importance of supportiveness as a key leadership quality, which helps foster team growth and achieve collective objectives.
Step-by-step explanation:
The sentence "The first quality that is important to being a good leader is by being supportive of the people you are leading" highlights supportiveness as a crucial leadership quality. Being supportive involves offering encouragement, resources, and assistance to team members, fostering a positive and collaborative environment. This quality is essential because it helps in nurturing the growth and development of a team, which in turn leads to better overall performance and attainment of shared goals.