If you want to become a data scientist, it is important that you learn either the Python or R programming language. Both languages are widely used in the data science community and have many powerful libraries that can help you with statistical analysis, data wrangling, machine learning, and more. While there are other languages that can be used for data science (such as Julia), Python and R are the most popular and will give you the best chance of being able to find a job in this field.