The best Du'aa for Laylatul Qadr
Aisha' (may Allah be pleased with her) said,
"I said, 'O Messenger of Allah ﷺ, if I know which night
is Laylatul Qadr, what should I say on that night?'
He ﷺ said,
'Say: Allahumma innaka 'afuwwun tuhibb al-'afwa fa'affu 'anni
O Allah, You are forgiving and You love forgiveness, so forgive me.
(Sunan at-Tirmidhi, Hadith No. 3435)