There are several American accents. Regional accents such as western, southern and Appalachian, are quite distinct as are accents specific to cities (especially Boston and New York). I suppose the "standard" American accent would be the one used by the national news anchors.
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mubrik88do you recommend to learn the American accent at this stage.The American accent is worth learning at any stage. Many learners find it easier than any other accent. I think you're right that you won't find it difficult because of your experience with watching American movies.