Is it obligatory for the average Muslim in Islamic countries to learn all the nullifiers of Islam to avoid falling into them?

Knowing the nullifiers of faith to avoid them and warn against them is important, and the science of Tawhid (monotheism) is among the best sciences, even if some of its issues are from the furood al-kifayat (communal obligations). Ibn Taymiyyah said: "It is obligatory upon every accountable person to know what Allah has commanded. Thus, everything specific to him among what Allah has obligated upon him, such as the rulings of zakat and Hajj if they are obligatory upon him, he must learn them. And it is obligatory upon the Ummah to know all that the Messenger brought, such that nothing of the knowledge that the Prophet conveyed is lost. As for the amount exceeding the individual's need, it is a fard kifayah."