Both R and Python are considered to be the best programming languages to flourish in the data science career.
Both are open source languages and provide access to many libraries. R is used for statistical analysis and Python is generic and good for a data scientist. Python is a general-purpose language but R is created by statisticians.
You can choose either Data Science With Python Training Course Online or Data Science with R Programming Training | R online course to make a career in data science as a beginner.
If you are already employed then based on your company and work preference opt for a course. Alternatively, go for R if you focus more on statistics and Python for a general data science approach.