As we draw closer to the last 10 nights of Ramadan, from the 21st night, there is something known as Itikaf, that is a sunnah of the Prophet Muhammad, peace be upon him. It’s his way. Now, it is called I’tikaf, where a person goes into… It’s not seclusion, but they go into the Masjid and they would remain in this place of worship with the idea of it serving as a spiritual retreat for the person.
There may be others with that person, but the idea is to develop taqwa and the consciousness of Allah, seek the forgiveness of Allah, and more than anything else, find the night of decree or Laylat al Qadr.
If Laylat al Qadr is said to be one of the last 10 nights of Ramadan, most likely one of the last odd nights from the last 10 nights of Ramadan, and most likely towards the end or the second half of the last 10 nights. So it would make it 25, 27, perhaps 29. But it does not mean it’s not going to be the 21st.
Sometimes even maybe the even nights according to some of the narration; So if the 21st night sets in as the sun is setting and you’re opening your fast, you go into the masjid and you make sure that you’ve taken whatever necessities you have, you’re going to remain in there in constant acts of worship for the next 10 nights.
You come out of that itikaf after 10 days and Insha Allah, so much goodness will be showered upon you by the blessings of Allah Subhanahu Wa Ta’ala.