Make du'a regularly during nighttime and after obligatory prayers.

This hadith speaks about the power of supplication, which is a form of prayer. It teaches us that supplications made during the middle of the night and after obligatory prayers are more likely to be answered by Allah. This is because nighttime is a special time for prayer, as it is when people can focus on their relationship with Allah without any distractions from worldly matters. Additionally, it emphasizes that we should not forget to pray our obligatory prayers as they are an important part of our faith and relationship with Allah. We should also remember that even if our supplications are not immediately answered, we should still have faith in Allah's plan for us and continue to make dua regularly.