Taking the train to Nanjing station, how can you arrange its sequence and what should be abandoned when time is tight? Are there any hotel recommendations? What transportation tools are available for travel? Still, where's a good place to buy some snacks?

I’d like to visit the Nanjing Museum, Jinming Temple, Confucius Temple, Wutong Tree, Music Platform, Zhongsan Scenic Area, Xuanwu Lake Park, and Vanguard Bookstore. Then I’ll see you guys!
If you were once a soldier, use your military discharge certificate (if not received, you can use the conversion and discharge certificates) to stay at a military hotel near the unit (much cheaper than outside hotels, such as Nanjing Haixuan Hotel next to Zhongshan Memorial Hall). If choosing to be an ordinary civilian, it’s convenient for deep exploration. The travel order is first visiting Zhongshan Memorial Hall during the day, then taking a night tour of Qinhuai River and Fuziming Temple at sunset; secondly visit the Presidential Palace and Xuanwu Lake, watching Nanjing Yangtze River Bridge at night; on the third day you can go to Niushou Mountain. Travelers are reminded not to do any shopping, as it increases luggage weight.
If you were ever in the military, use your discharge certificate (or transition certificate) to stay at a military hotel (which is much cheaper than regular hotels, such as the Nanjing Haiyuan Hotel near Zhongshan Mausoleum). If you’re an ordinary citizen, consider staying nearby scenic spots; it’s more convenient for a deep exploration of the area. The travel sequence should be: daytime visit to Zhongshan Mausoleum, nighttime stroll along Qinhuai River and Confucius Temple; next is a comprehensive tour of Xuanwu Lake and President Palace; on the third day, you can go to Niushou Mountain. Remember not to purchase anything extra, as it will only add up to your luggage.