What are the “three quls”? They refer to the last three surahs of the Quran: Al-Ikhlaas, Al-Falaq and An-Nas.
Why are they so important? Well, they have a lot of virtues. Also, they are amongst the shortest surahs in the Quran and are known by the majority of Muslims.
Given the fact that we recite them over and over and over and over again in prayer, it would make sense for us to finally read their explanation.
Here’s a very detailed tafsir by Dr. Bilal Philips: The Three Shelters.
This information was extracted from his course offered in the Islamic Online University. You can register for free and add this course (and others as well). There are audio lectures to supplement these notes as well as quizzes to test your knowledge. It’s very beneficial, masha-Allah.