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

"It is important to be aware of cultural differences when visiting Serbia. It is important to be respectful of local customs and traditions. Avoid making negative comments about Serbia or its people, as this can be seen as offensive. It is also important to dress modestly, especially when visiting religious sites. Avoid discussing sensitive topics such as politics or religion, as these can be seen as taboo. Additionally, it is important to be aware of local etiquette when it comes to dining, such as not starting to eat until the host has done so. Finally, it is important to be aware of the local language and to try to use it when possible," said another expat in Serbia.