Quinten Post wants to take his game to the next level in his second NBA season.The young Warriors center spoke exclusively with The Mercury News’ Joseph Dycus about his “busy” offseason and what he is looking to improve on after his standout rookie campaign. After recovering from an ankle injury that sidelined him for the Warriors’ NBA Summer League slate, Post told The Mercury News that he has been working out five days a week at Chase Center and is focused on improving his strength and agility to become a better defender in Year 2.“A big part for next year is guarding without fouling,” Post told Dycus. “I fouled too much, especially in situations where it wasn’t necessary, where I could just use my size to wall up and make guys take hard shots.”Post quickly earned a role in coach Steve Kerr’s rotations as a sharpshooting big, shooting a team-high 40.8 percent from deep in 42 games (14 starts), but he has made a concerted effort this offseason to improve as an all-around playmaker while not losing sight of what makes him such a unique weapon.“On the (screen and) roll, being able to pass in those...