If it is a 2-day trip to Hanoi, the approximate itinerary is as follows:
D1: Hanoi Huanjian Lake, 36th Street, St. Joseph's Cathedral, Hanoi Opera House (watching water puppetry), Vietnam National Museum of History, these places are basically very close and can be visited for a day
D2: Vietnam Military History Museum, Ba Dinh Square, Ho Chi Minh's Former Residence, Ho Chi Minh Memorial Hall, Ho Chi Minh Museum, Du Zhu Temple, etc., Vietnam National Art Museum. If you have enough time, you can also visit attractions such as West Lake in Hanoi, Zhenguo Temple, and Huolu Prison Museum. Choose according to the personal preferences of the host