To make a DIY backyard soccer goal, you will need several materials including PVC pipes, connectors, PVC cement, netting, zip ties, and stakes. Start by cutting the PVC pipes to the desired sizes for the goal frame. Use the connectors and PVC cement to assemble the frame. Attach the netting to the frame using zip ties, making sure it is secure. Lastly, stake the goal into the ground to ensure it stays in place during play.