From time to time you may need to recalibrate the touchscreen. This can be done by going to this location on your Nokia Nuron Menu > Settings and Phone > Touch input > Touch screen calibration and follow the instructions.
To save energy and maximize on the battery life close and disable applications, services, and connections when not in use, reduce the brightness of the screen, set power saver mode to the minimum period of inactivity and disable unnecessary sounds, such as keypad and other tones.
Make use of the in device help under Menu > Help and ensure you constantly check for updates from Nokia using Nokia Ovi Suite. Remember to check back here whenever you need to brush up on how to clear memory on your Nokia 5230 Nuron.
You can have a look at these other guides such as the Nokia N97 User Guide and the Nokia C6 User Guide as some of the performance tips and tricks are similar to those of the Nokia 5230 Nuron.