There are a few points to consider to make the perfect spinach fatayer. 1. Do not use a soggy filling, this will cause the pastry to open during baking due to moisture and sogginess. 2. Do not overfill, ensure there is enough dough to create a good seal when closing the triangle 3. Place the filling in the center and do not allow any dampness to touch the dough where it will be sealed, as this will cause the fatayer to open during baking.