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

"It is important to be respectful of South African culture and customs when visiting Johannesburg. It is considered rude to point with your finger, so it is best to use an open hand when gesturing. It is also important to dress modestly, especially when visiting religious sites. Avoid making negative comments about South Africa's history or politics, as this can be seen as offensive. Additionally, it is important to be aware of the local customs and to ask permission before taking photographs of people," said another expat in Johannesburg, South Africa.