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ein and eine have same meaning 'A;.but ein is used for masuline and neuter like man and girl.Man is masculine in german and girl is neuter so it would be ein Mann which means 'A man' and ein Mädchen wich means 'A gir'.eine is used foe femine which means woman or female.it would be eine Frua which means A woman.
You have to use the appropriate article depending on the gender. That is explained here: https://www.duolingo.com/skill/de/Basics-1
You just need to memorise the gender of a noun when you learn it. Eventually you might notice some helpful patterns, but there are so many exceptions that there aren't many solid rules, unfortunately.