Nowadays there are various certification courses available online, and both students and professionals are all able to have an edge over all other applicants if they leverage their degree or certification on the same. You can refer to Intellipaat's online Data Science certification course as it will help you in preparing for a career as a Data Scientist and highlights concepts and tools you will need during the entire data science pipeline, from asking the right kinds of questions to making conclusions and publishing results. It will also help you in developing a portfolio of projects that you can showcase during interviews. And if you are more into videos then do check out the following video tutorial which will help you in mastering in the field of Data Science:
If you are a beginner and want to know more about Python and R programming language then do refer to the following video tutorials: