Briefly: Duolingo

Learning new languages can deepen your understanding of different cultures. Such bridges lead people to peace, sharing, and growth for all. Find a group, an app, or a course that interests you; start learning about other cultures through their language; then find a community where you can practice your skills and get to know a different people in their own words. Start anywhere you like, but start today!

https://www.duolingo.com/