Yeah, Magisteriun simply means teaching authority–an older phrase you sometimes see is “ecclesia docens”–basically it means the constant teaching of the college of bishops, including their head, the bishop of Rome as chief teacher. Since they have the responsibility of teaching and handing on the faith always and everywhere until the end of time, it’s pretty much impossible to collect every single act of teaching of every bishops, gathering of bishops, or even Popes.
Denziger, which Vico posted, is a good collection of especially noteworthy acts. The Catechism of the Catholic Church is also a good, comprehensive summation. The Vatican website has many recent papal acts, etc.