The difficulty of a language depends on many things. Native speakers of English can learn Spanish with less difficulty than Native Korean speakers, since English is closer to Spanish than Korean is.
On top of that some languages are considered easy to learn to speak, but difficult to learn to write and vice versa. An example would be Mandarin Chinese, from the perspective of Native English speakers it is considered easy to learn to speak, but difficult to read and write.
The language barrier is usually the most difficult aspect.
I can't imagine many disadvantages to learning English. English is one of the most prolific language in the world, with a lot of the major/most wealthy countries using it as their native language. It is however among the most difficult languages to learn.
It is difficult to determine which language most people are using, as it varies depending on the region, culture, and context. However, English and Mandarin Chinese are two of the most widely spoken languages in the world.
Croatian is a complex language and probably one of the most difficult language types on the world. You must be born in Croatia if you want to speak Croatian perfectly or govoriti Hrvatski savršeno.
Mandarin Chinese is the most spoken language in the world.
Actually it is a tie. Arabic is the most difficult spoken language. Writing Arabic is the second hardest. Speaking Chinese is the second hardest, writing it is the first. Learn both languages! You'll never have to go through that painstaking nothing to do feeling ever again! *Hebrew is at third.
Mandarin Chinese is the language spoken by the most people in the world as a native language.
The third most spoken language in the world is Spanish.
Mandarin is the most widely spoken language in the world.
Mandarin Chinese is the language with the most tones spoken in the world.
In 2014, the most spoken language in the world was Mandarin Chinese.
English is the most widely spoken language in the world.