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Knowing another language related to the one you're learning will give you an advantage in learning vocabulary. If you know Spanish, you'll have a much easier time learning French or Italian vocabulary than someone who doesn't because all three languages stemmed from Latin and share a lot of similar vocabulary. Those new vocabulary words you are learning in your new language will dramatically shorten the learning curve should you wish to go on and learn another language from the same language family. Even if you go into a completely different language family, the techniques you perfected in learning vocabulary now will serve you well in learning other languages.