Ask for help about how to learn a third foreign language

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I am running a business now, need to learn a third foreign language ,and i used to learn English as my second foreign language , but now i have the chance to learn a third language, for example, french. i am learning French now , but i found it is rather difficult for me . so i just want to get help from people who have similar experience, and would anyone kindly to tell me how to learn french.