The big majority of people think by learning English then you will be able to communicate with all world. While it would not be the case. The easiest option to learn language is to have an account on Duolingo and learn languages that there is big chance to be there like one day for italian, one day for spanish and one day for german and this would be a full work either to convert images to mp4 video to write notes after duolingo lesson and therefore not everyone will do such work. Then it would be a barrier because you cannot learn a lot of languages the essentials that could serve you.