What are the best Sunnahs of the Prophet, peace and blessings be upon him, and their priorities, or in other words, what are the essential Sunnahs that must be followed?

The religion of Islam is based on the oneness of God and worshipping Him only as He has legislated. Every deed must be sincere and correct, meaning for the sake of God and in accordance with the Sunnah of the Prophet, peace be upon him. Following the Prophet, peace be upon him, is obligatory in all matters, especially concerning the fundamentals of faith, the practical pillars of Islam, and their confirmed Sunnahs. It is not permissible to prioritize opinion or rationality over them.