What are the key steps to ensure correct p trap installation in a plumbing system?

The key steps to ensure correct p-trap installation in a Plumbing system are: 1. Measure and cut the pipes to the correct length. 2. Connect the p-trap to the drain pipe using appropriate fittings. 3. Ensure the p-trap is level and securely attached. 4. Test the p-trap for leaks by running water through the system. 5. Make any necessary adjustments to ensure proper functioning.