I recommend starting with the programming language Python to learn data science but you should also be familiar with R programming, SQL, NoSQL, and SAS. You should start with Python for Data Science because it has an abundance of libraries for data analysis, data modeling, computer vision, and natural language processing applications. After that, having a knowledge of SQL and NoSQL is important for storing and retrieving data from relational and non-relational data from databases. SAS (Statistical Analysis Software) has the same capabilities as Python and R for statistical computing and data modeling, mostly used in the banking sector. To kick-start your career and be an expert in the area of Data Science I would strongly recommend you to go with Intellipaat's Data Science Certification in Collaboration with IIT Madras.
Also, watch this video on Data Science:
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