What did martin Luther criticize about church?

Martin Luther criticized the Catholic Church for its practice of selling indulgences, which he believed undermined true repentance and salvation. He also challenged the authority of the Pope and emphasized that faith alone, rather than good works, was the pathway to salvation. Additionally, Luther advocated for the translation of The Bible into the vernacular, making it accessible to the laypeople, which he felt was essential for a personal relationship with God. His critiques sparked the Protestant Reformation, leading to significant religious and societal changes.