Etiquette of making dua and importance of understanding of what you’re asking

The Messenger of Allah ﷺ said: “Make dua to Allah with certainty of it being answered, and know that Allah does not answer a dua that comes from a heedless and a distracted heart.”  

قَالَ رَسُولُ اللَّهِ ﷺ ادْعُوا اللَّهَ وَأَنْتُمْ مُوقِنُونَ بِالإِجَابَةِ وَاعْلَمُوا أَنَّ اللَّهَ لاَ يَسْتَجِيبُ دُعَاءً مِنْ قَلْبٍ غَافِلٍ لاَهٍ