Narrated Abu Huraira:
The Prophet (ﷺ) said, "Whoever fasted the month of Ramadan out of sincere Faith (i.e. belief) and hoping for a reward from Allah, then all his past sins will be forgiven, and whoever stood for the prayers in the night of Qadr out of sincere Faith and hoping for a reward from Allah, then all his previous sins will be forgiven.”
When the last ten days of Ramadan came, the Prophet (ﷺ) kept vigil and prayed during the whole night, and tied the wrapper tightly, and awakened his family (to pray during the night).
Look for the night of Qadr in the last seven nights
1- Narrated Ibn `Umar:
Some men amongst the companions of the Prophet (ﷺ) were shown in their dreams that the night of Qadr was in the last seven nights of Ramadan. Allah's Messenger (ﷺ) said, "It seems that all your dreams agree that (the Night of Qadr) is in the last seven nights, and whoever wants to search for it (i.e. the Night of Qadr) should search in the last seven (nights of Ramadan).
2- Narrated Abu Salama:
I asked Abu Sa`id, and he was a friend of mine, (about the Night of Qadr) and he said, "We practiced I`tikaf (seclusion in the mosque) in the middle third of the month of Ramadan with the Prophet (ﷺ) . In the morning of the 20th of Ramadan, the Prophet (ﷺ) came and addressed us and said, 'I was informed of (the date of the Night of Qadr) but I was caused to forget it; so search for it in the odd nights of the last ten nights of the month of Ramadan. (In the dream) I saw myself prostrating in mud and water (as a sign). So, whoever was in I`tikaf with me should return to it with me (for another 10-day's period)', and we returned. At that time there was no sign of clouds in the sky but suddenly a cloud came and it rained till rainwater started leaking through the roof of the mosque which was made of date-palm leaf stalks. Then the prayer was established and I saw Allah's Messenger (ﷺ) prostrating in mud and water and I saw the traces of mud on his forehead."
Search for the night of Qadr in the odd nights
1- Narrated `Aisha:
Allah's Messenger (ﷺ) said, "Search for the Night of Qadr in the odd nights of the last ten days of Ramadan."
2- Narrated Abu Sa`id Al-Khudri:
Allah's Messenger (ﷺ) used to practice I`tikaf (in the mosque) in the middle third of Ramadan and after passing the twenty nights he used to go back to his house on the 21st, and the people who were in I`tikaf with him also used to go back to their houses. Once in Ramadan, in which he practiced I`tikaf, he established the night prayers at the night in which he used to return home, and then he addressed the people and ordered them whatever Allah wished him to order and said, "I used to practice I`tikaf for these ten days (i.e. the middle third but now I intend to stay in I`tikaf for the last ten days (of the month); so whoever was in I`tikaf with me should stay at his place of seclusion. I have verily been shown (the date of) this Night (of Qadr) but I have forgotten it. So search for it in the odd nights of the last ten days (of this month). I also saw myself (in the dream) prostrating in mud and water." On the night of the 21st, the sky was covered with clouds and it rained, and the rainwater started leaking through the roof of the mosque at the praying place of the Prophet (ﷺ) . I saw with my own eyes the Prophet at the completion of the morning prayer leaving with his face covered with mud and water.
3- Narrated `Aisha:
Allah's Messenger (ﷺ) used to practice I`tikaf in the last ten nights of Ramadan and used to say, "Look for the Night of Qadr in the last ten nights of the month of Ramadan."
4- Narrated Ibn `Abbas:
The Prophet (ﷺ) said, "Look for the Night of Qadr in the last ten nights of Ramadan ,' on the night when nine or seven or five nights remain out of the last ten nights of Ramadan (i.e. 21, 23, 25, respectively).
5- Narrated Ibn `Abbas:
Allah's Messenger (ﷺ) said, "The Night of Qadr is in the last ten nights of the month (Ramadan), either on the first nine or in the last (remaining) seven nights (of Ramadan)." Ibn `Abbas added, "Search for it on the twenty-fourth (of Ramadan).
The knowledge of the night of Qadr was taken away because of the quarrelling
Narrated 'Ubada bin As-Samit:
The Prophet (ﷺ) came out to inform us about the Night of Qadr but two Muslims were quarreling with each other. So, the Prophet (ﷺ) said, "I came out to inform you about the Night of Qadr but such-and-such persons were quarreling, so the news about it had been taken away; yet that might be for your own good, so search for it on the 29th, 27th and 25th (of Ramadan).
Good deeds in the last ten days of Ramadan.
With the start of the last ten days of Ramadan, the Prophet (ﷺ) used to tighten his waist belt (i.e. work hard) and used to pray all the night, and used to keep his family awake for the prayers.
Make Every Last 10 nights of Ramadan
1- Do not be like the majority of people who wait for the 27th to spend a night in worship. The Prophet (salAllahu alayhi wa salam) stayed in I’itikaf (seclusion) for all 10 nights seeking Allahs pleasure. We have no guarantee that laylatul qadr will be the 27th night and in fact with moon sighting issues (yes i'm bringing it back up :)), we don’t even know for a fact which night is the 27th. So seek laylatul qadr every night and you will certainly catch it. Not only that, but you would have spent the other 9 nights conversing with your Creator, receiving His mercy, and elevating your status.
2- Catch Fajr and Isha in congregation. `Uthman bin `Affan (May Allah be pleased with him) reported: I heard the Messenger of Allah (sallallaahu ’alayhi wa sallam) saying: "One who performs `Isha' prayer in congregation, is as if he has performed Salat for half of the night. And one who performs the Fajr prayer in congregation, is as if he has performed Salat the whole night.''[Muslim]
3- Pray the entire set of taraweeh with the Imam. Taraweeh is qiyaamul layl. Yes its permissible to pray as little or as much of it as you want on any given day. But the Prophet (salAllahu alayhi wa salam) said that whoever prays with the Imam “until he leaves” would receive the full reward of qiyaamul layl for the whole night. No one of us will be able to spend the entire night praying so this, along with tip 3, is a good way to ensure that you get the entire credit.
4- spend the night in different forms of worship so that you don’t get bored. You don’t have to spend the whole night in prayer. Instead you can take breaks and just make dua. You can also specify a certain number of chapters of the Quran you want to ready every night. You can also read a translation of Quran or some ahadeeth as a break between prayers. Just keep yourself engaged. It’s also good to give charity and perform any extra good deeds in these nights.
5 - Plan your duas. This is the night in which the entire next year will be decreed. So choose your duas wisely and make sure that you make them with a clean heart.