The main teaching of Suratul Ikhlas is monotheism. Suratul Ikhlas is the 112th chapter of the Quran, and it consists of only four verses. In these verses, Allah (SWT) emphasizes the oneness and unity of God.
The chapter begins with the declaration that Allah is one, and that there is no god but Him. It then emphasizes that Allah is eternal, and that He has no beginning or end. The chapter ends with the statement that there is none like Allah, and that He is unique and incomparable.
Through this chapter, Allah emphasizes the importance of the belief in the oneness of God in Islam. Muslims believe in the concept of tawhid, which is the belief in the oneness of God. Tawhid is considered the most fundamental concept in Islam, and it is the basis of Islamic belief and practice.
In summary, the main teaching of Suratul Ikhlas is monotheism. The chapter emphasizes the belief in the oneness and unity of God, which is a fundamental concept in Islam.