Ayat el-Kursi

bu Umamah Radiyallahu 'anhu narrates that Rasulullah Sallallahu 'alaihi wasallam said: He who recites Ayatul Kursi after every obligatory Salat, nothing but death restrains him from entering Paradise. In another narration: “Qul hu wallahu Ahad” is to be recited after Ayatul Kursi.
(Book: Muntakhab Ahadith, English Hadith 31)

Hasan ibne-'AlT Radiyallahu 'anhuma narrates that Rasulullah Sallallahu 'alaihi wasallam said: He who recites Ayatul Kursi after obligatory Salat, is in the protection of Allah till the next Salat.
(Tabarani) (Book: Muntakhab Ahadith, English Hadith 32)

Ubayy ibne-Ka'b Radiyallahu 'anhu narrates that Rasulullah Sallallahu 'alaihi wasallam asked: O Abu Mundhir! Do you know which verse from the Book of Allah is the greatest?
I replied: “Allah and His Messenger know best!” Rasulullah Sallallahu 'alaihi

wasallam asked: “O Abu Mundhir. Do you know which verse from the Book of Allah is the greatest?”

I said: “Ayatul kursi”

He then struck my chest and said: “Congratulation to you for this knowledge, Abu Mundhir!”

(Book: Muntakhab Ahadith, English Hadith 35)

Abu Hurairah Radiyallahu 'anhu narrates that Rasulullah Sallallahu 'alaihi wasallam said: For everything there is a crest, and indeed the crest of the Qur'an is Surah Al-Baqarah. And in it there is a verse, which is the chief of all the verses in the Qur'an, and that is Ayatul kursi. (Tirmidhi)[10]
Ma'qil ibne-Yasar Radiyallahu 'anhu narrates that Rasulullah Sallallahu 'alaihi wasallam said: The crest, and apex of Qur'an is Surah Al-Baqarah. With every verse of it, eighty angels descend. The Ayatul kursi has been revealed from beneath the Divine Throne, then it was integrated into Surah Al-Baqarah. Surah Yasin is the heart of the Qur'an. Whoever recites it, to please Allah and for the Hereafter, but he is pardoned. So recite this near your dying people.
(Book: Muntakhab Ahadith, English Hadith 51)

Because the Throne Verse is believed to grant spiritual or physical protection, it is often recited by Muslims before setting out on a journey and before going to sleep.[3]

Ayat al-Kursi is regarded as one of the most powerful ayahs in the Quran because when it is recited, the greatness of God is believed to be confirmed. The person who recites this ayah morning and evening will be under protection of Allah from the evil of the jinns; this is also known as the daily adkhar.
It is used in exorcism, to cure and protect from jinns.

one who recites Ayatul Kursi regularly is given by Allah wisdom to his heart, faith, sincerity, reliance and honour. One who recites it he'd be safe from instigations of Satan and forgetfulness.