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The field of data science has evolved significantly in the past decade. Being a data scientist does not mean you need to know and be capable of doing everything that comes under its banner. Python and R Programming are the most popular programming languages for data science. There are also many free online courses available that can help you with this. Don’t wait till you know enough for making a project, just get started with whatever you know till now. Make your choice based on the job postings and industrial demands for them.