What cultural faux pas should I try to avoid making in Guangzhou?

"It is important to be respectful of traditional Chinese customs and culture when visiting Guangzhou. One should avoid speaking too loudly in public, as this is considered to be rude and inconsiderate of others around. Additionally, it should be noted that when using public transportation, it is necessary to maintain silence and be respectful of those around you. Furthermore, when conversing with local people, be mindful to avoid making jokes or comments regarding preconceptions or opinions that could be seen as offensive, particularly regarding matters of China's history and politics. Finally, it is advisable to take off ones shoes before entering a Chinese home and to be aware of any food etiquette rules when dining with locals," remarked another expat in Guangzhou, China, China.