Inside the Statue of the Goddess

The location Inside the Statue of the Goddess is where Link obtains the the Goddess Sword and meets Fi who joins him as a partner. After Link pulls out the sword, Fi gives him the Emerald Tablet. After using a Skyward Strike on an 'emblem', will lift a platform with a gap on it, of which you promptly insert the emerald tablet into. This causes a green beam of light to be emitted from the Statue's hands. The light heads to the southeast of skyloft and opens up passage to Faron Woods. You return to the inside of the statue of the goddess to insert the Ruby and the Amber tablet's which you get from the Skyview Temple and Earth Temple respectively. These tablets cause red and yellow beams of light that open up Eldin Volcano in the north and Lanaryu Desert in the south west respectively. Afterwards you never really have to go inside the statue again.