In a large mixing bowl, create a mound with the flour and make a well in the center. Crack the eggs into the well, add salt and olive oil if using. Gradually mix the eggs into the flour using a fork or your fingers, then knead the dough until smooth and elastic, about 8-10 minutes. Wrap the dough in plastic wrap and let it rest for 30 minutes. After resting, divide the dough into smaller portions. Roll out each portion on a floured surface with a rolling pin or a pasta machine until very thin. Cut into your desired shapes, such as strips for fettuccine or sheets for lasagna. Cook the pasta in boiling salted water for 2-3 minutes or until al dente. Drain and serve fresh or dry for storage.