Reference of this sentence

Maintain local knowledge and practices
Local languages are always carriers of traditional knowledge, myths, folklore and cultural practices that are passed down from generation to generation. By preserving the local language, the community can ensure the continuity of its heritage and maintain its unique identity. The preservation of languages such as Swahili in East Africa or Yoruba in Nigeria is important to preserve local knowledge and practices.

This sentence emphasizes the importance of maintaining local knowledge and practices by preserving traditional languages such as Swahili in East Africa or Yoruba in Nigeria.