You may ask why the first mitzvah of Shabbat is the kindling of lights. That is because Shabbat is actually a celebration of the Creator and His Creation. G‑d’s creation of the world follows a seven-day cycle, which peaks each Shabbat and begins anew. At Creation, the first thing that was brought into being was light. Therefore, it is appropriate to kindle lights at the start of Shabbat in commemoration of the first light that was created.