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Python https://www.udacity.com/course/design-of-computer-programs--cs212 (Optional if you want to be good) (Difficult)
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In-depth databases (https://www.youtube.com/playlist?list=PLSE8ODhjZXjbohkNBWQs_otTrBTrjyohi) (Optional if you want to be good) (Difficult)
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Data base normalization https://www.youtube.com/watch?v=GFQaEYEc8_8
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Data warehouse
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Map-reduce
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Spark architecture https://www.youtube.com/watch?v=OlYKyZvN2FA
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Spark https://www.udemy.com/course/best-hands-on-big-data-practices-and-use-cases-using-pyspark/
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Kafka