Sewing a dart starts with the simple process of pinning and folding them prior to the stitching process. For this to be possible, all dart lines have to be transferred from the pattern to the wrong side of the fabric.
A single pointed dart should have a vanishing point and three dart lines extending from the pong to each notch along the seam edge. The center line is the dart's fold line and will facilitate the dart folding process.
When sewing a single pointed dart, start by folding it (from wrong side) directly on the center fold line. When the dart is folded precisely on this line, the other two dart line (also knows as dart legs) should overlap and align perfectly. The dart will be stitches on top of these two matching lines.
To ensure that the single pointed dart is folded properly, insert a pin horizontally through both overlapping dart lines as shown.
If you look on the other side of the folded dart, the pin should fall directly on the marked dart line as shown. If it does not, remove the pin and adjust the dart fold until the lines are perfectly overlapped- again, use a pin in the testing process.
Once the single dart is perfectly folded down the center, it helps to iron the center fold line within the body of the dart only, to keep it stable during the remaining pinning and sewing process.