رَبَّنَا آتِنَا فِي الدُّنْيَا حَسَنَةً وَفِي الْآخِرَةِ حَسَنَةً وَقِنَا عَذَابَ النَّارِ
Rabbana atina fid-dunya hasanatan wa fil-akhirati hasanatan wa qina 'adhaban-nar
Our Lord, give us good in this world and good in the Hereafter, and protect us from the punishment of the Fire.
Recite frequently - the most beloved dua to the Prophet
Anas (RA) said: 'The Prophet (PBUH) used to say this dua more than any other.' It encompasses all good in both worlds.