Quick Transmigration: Learning Makes Me Improve

The protagonist, Zhang Yu, dies unexpectedly but gains the [Progress System], which allows him to improve as long as he persists in learning.
Silly Zhu in "Birds Fill the Courtyard".
Qi Tongwei in "In the Name of the People".
Wei Heshang in "Bright Sword".
Lin Pingzhi from "The Smiling, Proud Wanderer".
The Return of the Condor Heroes.
Duan Yu from "Demi-Gods and Semi-Devils".
Zhang Tie, author of "A Record of a Mortal's Journey to Immortality".
……
(These are the tentative plans. Please leave a comment if you have any worlds you'd like the protagonist to travel to.)