Yes. I learned Spanish on Duolingo and used it to travel through Cuba (where very few people speak English). It worked well enough, I was able to communicate.

Yes. I learned Spanish on Duolingo and used it to travel through Cuba (where very few people speak English). It worked well enough, I was able to communicate. Not knowing Spanish would make things much more difficult. Of course I have by now mostly forgotten it, a language that isn't used frequently (best via immersion, living where it's spoken by plenty of people) will atrophy...