There is the starting platform. In front of the starting platform is a narrow strip. Under the strip are two circles, a bigger one and a smaller one. The platform with the bigger circle has a blue goal while the platform with the smaller circle has a green goal.
To get to the blue goal, look at the mini map. If you see that you're in line with the wider circle, fall down onto it. Once you have landed safely, roll along the long path to the blue goal. Roll carefully; and once you are at the circular platform with the blue goal, go to the side with the goal's ribbon, and fall into the goal.
For the green goal, repeat the same strategy as for the blue goal, but fall onto the smaller circle instead. Be more careful though since every part for the green goal is harder than for the blue goal.