Now you will learn to use Edge Loop to select the edges and gain experience in adjusting the control points of the Subdivision Surfaces:
Press Numpad 7.
Select Wireframe in the Viewport Shading menu in the 3D View header.
Move the cursor over the horizontal edges at the widest part of the sloop. Press Alt+RMB.
Press S, X, and use the mouse to scale the surface until it is as wide as the boat in the template, then press theLMB. The control edges will be wider than the width of the boat image in the template. For best control of scaling, remember to move the mouse away from the center of the 3D View before you start scaling.
Repeat this with the horizontal edges at the front of the cabin, and where the hull begins to narrow toward the bow, as seen in the following screenshot.
The Edge Loop command will not work at the ends of the sloop. Press A to deselect the edges, then press B and select the edges at the bow.
Press S, X, and use...