These matters require from the believing man and woman, young and old to learn.
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"The first is: knowledge" one is obliged to learn and gain insight so that he will upon clarity. He must learn about the religion of Allah which he was created for. This knowledge is learning about Allah, His Prophet, and the religion of Islam with proofs.
So, that is the first matter that the servant gains insight about who is his Lord?
Hence, he learns that his Lord is the Creator who created him, provides his subsistence, and confers His favors upon him. Allah created those who came before him, and those who will come after him. He is the Lord of all that exists. Allah is the one true deity and object of servitude, no one besides Him deserves to be worshiped. Not a close angel, a messenger who was sent, not a Jinn, no human, no idol or anything else deserves to be worshiped; Rather, true worship is a right that belongs to Him alone. He is the sole object of worship in truth )شكلة وال
He deserved to be worshipped. He is the Lord of all that exists. He is your Lord and Master, your Creator, and your true Deity )سبحانه وتعال So, you should know this first matter which is knowing your Lord, your Prophet, and your religion with proof. It is what Allah says and his Prophet said, not by opinions and statements of so and so person. Instead it is with proofs from the verses of the Qur'an and Hadith. This is the religion of Islam that you have been obliged to enter and commit to.