What is the ruling on a man praying at home to protect himself from Corona, and does the ruling differ if he goes out for worldly matters? Should he leave university for this reason? And what about exposing his family to danger upon returning to them?

It is permissible to miss the congregational prayer due to fear of contagious disease, and it is better to pray it congregationally at home. As for the Friday prayer, the general rule is that it is obligatory to pray it in the mosque for anyone who hears the call. The concession varies according to the reality and the expected harm, and the estimation of harm from general calamities is referred to specialists. A person's going out to fulfill their needs does not prevent them from being granted the concession to miss the Friday and congregational prayers if the reason for the concession exists. Exaggerating in mixing with people without need may be an indication of the insincerity of the claim of fearing contagion. The general rule is that prayer in the mosque is superior and better, and it is not obligatory to abandon the university due to illness.