DuolingoBy The Cove February 13, 2019
Duolingo is a superb, free language app for iOS and Android. You can learn Spanish, French, German, Portuguese, Italian, Irish, Dutch, Danish, and Swedish.
It only takes 5 mins a day to get the basics of a foreign language. Mastering one helps allow you to rapidly adjust to others ... for example for a deployment or operation. What better use of a few minutes of each day!