What are the most speaking languages?

I mean the 1st language and where,if you have information for many languages, please hand out them to me.I mean, China would be a place that Chinese speak but I don't mean to tell me that since there the most people there that ,the most speak that language.I mean Since it's many people a language to learn is Chinise.Or where else they speak it.I know that in Canada many people speak French.Also , do anywhere else, expect Greece, people speak Greek????