This list consists of ~20 tutorials to learn data science. You can think of this list as a "Free Online Nano Book". You'll learn core data science concepts, algorithms and applications. Everything is 100% free.

What is Data Science? Why Data Science?
Trillions of gigabytes of data is being produced yearly, and the number is still growing exponentially. It is estimated that for every person, 1.7 megabytes of data will be produced every second by 2020.
Our society is increasingly becoming data dependent. Data is only a raw material and extracting information from it requires further work. Data Science helps us make sense of data.

Growth of Data. Source: Patrick Cheesman
Data Science is an interdisciplinary field, and makes use of methods and technologies from different fields such as computer science, databases, mathematics, statistics and machine learning. It is involved with the collection, preparation, analysis, visualization, management and preservation of data.
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