Describe three areas of Russian life that Peter the Great reformed or modernized and one area that he did not change significantly.?

Peter the Great reformed Russian life by modernizing the military, introducing Western-style training and technology to strengthen the army and navy. He also revamped administrative structures, establishing a more efficient government with a focus on meritocracy and reducing the power of the nobility. Additionally, he promoted cultural changes, encouraging Western education, dress, and social customs. However, he did not significantly change the serfdom system, which remained deeply entrenched in Russian society.