What are some steps the Council of Trent took to correct the course of the Catholic Church?

Answer 1

Catholic Answer
The principal dogmatic decisions were:
. the confirmation of the Nicene Creed; the authenticity of the Latin Vulgate and the canonicity of all books contained therein and of them only;
. the definition of the doctrine of Original Sin; the precision of the doctrine of Justification, condemning justification by faith alone and imputation of grace;
. the condemnation of thirty errors about the sacraments;
. the definition of the Real Presence and of Transubstantiation as its mode:
. the precision of the doctrine of the sacraments of Penance and Extreme Unction;
. the declaration that holy Communion in both kinds was not necessary for lay-people and clerics not celebrating, Christ being received whole and entire under either species;
. the precision of doctrine concerning the sacrifice of the Mass and the sacraments of holy Orders and Matrimony;
. the affirmation of the doctrines of Purgatory, of the invocation of saints and the veneration of them, their relics and images, and of Indulgences.
. Far reaching decrees of reformation in discipline and morals were adopted involving many alterations of canon law.
from A Catholic Dictionary, edited by Donald Attwater, Second edition, revised 1957

Answer 2

The Council of Trent clarified the doctrines of the Catholic Church, denounced heresies, reaffirmed the authority of tradition alongside scripture, and established guidelines for the training and behavior of clergy to address issues of corruption and ignorance within the church.