To make a DIY backyard soccer goal, you will need a few materials such as PVC pipes, connectors, netting, and zip ties. Start by measuring and cutting the PVC pipes to the desired height and width of the goal. Then, assemble the pipes using the connectors to create the frame of the goal. Attach the netting to the frame using zip ties, making sure it is securely in place. You can add additional support by adding stakes or sandbags to the base of the goal.