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this language is my mother language.otherwise an english language you can spoken to learn by own.
I think for any person english is the language which one can learn very easily beacuase this language consist few alphabet and most of the people know this language apart from their mother tongue. So you can easily find the people speaking engilsh you can interact with them.
As per your name i guess you know Arabic , so in my view Arabic is the easiest language to learn , but fluency cannot be learned in any language until and unless you are having gathering with people with relevant language , I guess English is second most easiest language to learn . It starts with alphabets and then you can go by your own .