The document summarizes the benefits of excellent language teaching and learning, which involves teaching grammar and vocabulary in context rather than in isolation, making connections to other disciplines, and incorporating culture into all lessons rather than separating language from its cultural context. It notes that this approach leads to benefits like greater cognitive flexibility, higher-order thinking skills, and higher math and verbal SAT scores with each additional year of language study. It also emphasizes the importance of maintaining one's home language and discusses concepts like balanced bilingualism, third-culture kids, and ways parents can support language learning.