How can you make a shelter waterproof windproof and insulated?

To make a shelter waterproof, use materials like tarps, waterproof fabrics, or treated canvas for the roof and walls. For windproofing, ensure the structure is well-sealed and add windbreaks such as trees or additional canvases. Insulation can be achieved by using materials like foam boards, straw, or blankets in the walls and ceiling to retain heat. Additionally, elevate the shelter off the ground to prevent moisture infiltration and enhance warmth.