Surah Al Kahf is a Meccan revealed after Surah Al Ghashiya in the 8-10 year after the first revelation. Khaf means An open large cave in the Mountains, if it is a closed cave it is called Ghaar.
It begins with Alhamdollilah. In the Quran the word Alhamdollillah comes 38 times. Five Surahs begin with Alhamdollillah.
Hadith: Fadal(Blessings) of Surah Kahf
The onewho recites first three ayas will be protected from the fitna of Dajjal and if he memorizes the first ten ayahs then he is protected from the fitna of Dajjal(Muslim)
If one recites this on Jumma then his path is illuminated between two jummas.
RasoolAllah pbuh said :
Recite this(Surah Kahf) it brings Sakeena.
What is Sakeenat: serenity, Allah’s Rahma, angels descending with Allah’s mercy.