Source: duolingo.com

While Mandarin is one of the hardest languages for English speakers to learn, the first several languages on our list are here not because they are fundamentally easy to learn, but rather because the languages are large enough to easily find learning resources.

For example, while Bengali is more closely related to English (they are both Indo-European), it isn’t a global language and therefore not many quality learning materials exist. (The keyword is “quality.”)