Create arrays of structs to store multiple instances. Declare the struct type, then array name and size in brackets. Each element is a complete struct with all members. Example: Point points[10]; creates an array of 10 Point variables.
Access each with index: points[0], points[1]. Access members with dot: points[0].x = 5;. This replaces parallel arrays. Instead of int x[10]; int y[10]; where you manually sync indices, you have Point points[10]; where each element groups related data.