اللَّهُمَّ انْفَعْنِي بِمَا عَلَّمْتَنِي وَعَلِّمْنِي مَا يَنْفَعُنِي وَزِدْنِي عِلْمًا
Allahumma-nfa'ni bima 'allamtani, wa 'allimni ma yanfa'uni, wa zidni 'ilma
O Allah, benefit me from what You have taught me, teach me what will benefit me, and increase me in knowledge.
This du'a is perfect before studying or seeking any kind of knowledge. It asks for three things in a beautiful sequence: make useful what I already know, then teach me more useful things, then keep increasing my knowledge.
Related Du'as
اللَّهُمَّ إِنِّي أَعُوذُ بِكَ أَنْ أَضِلَّ أَوْ أُضَلَّ أَوْ أَزِلَّ أَوْ أُزَلَّ أَوْ أَظْلِمَ أَوْ أُظْلَمَ أَوْ أَجْهَلَ أَوْ يُجْهَلَ عَلَيَّ
O Allah, I seek refuge in You from going astray or being led astray, from slipping or being caused to slip, from wronging others or being wronged, from behaving ignorantly or being treated with ignorance.
Sahihرَبِّ هَبْ لِي حُكْمًا وَأَلْحِقْنِي بِالصَّالِحِينَ
My Lord, grant me wisdom and join me with the righteous.
Sahihاهْدِنَا الصِّرَاطَ الْمُسْتَقِيمَ صِرَاطَ الَّذِينَ أَنْعَمْتَ عَلَيْهِمْ غَيْرِ الْمَغْضُوبِ عَلَيْهِمْ وَلَا الضَّالِّينَ
Guide us to the straight path — the path of those You have blessed, not of those who earned anger, nor of those who went astray.
Sahihاللَّهُمَّ عَلِّمْنِي مَا يَنْفَعُنِي وَانْفَعْنِي بِمَا عَلَّمْتَنِي وَزِدْنِي عِلْمًا
O Allah, teach me what benefits me, let me benefit from what You have taught me, and increase me in knowledge.
Hasan