There are a lot of data literacy and data science courses available online. I am sure you have your own favourites! I was impressed today to learn that the courses on CoginitiveClass.ai are both free and grant users Credly badges on completion. Academic students of data science typically don’t worry about certifying their programming skills. However, hiring managers don’t have the time to read through a paper to find out if the author used sophisticated quantitative skills or not. So get certified! And ask probing questions about applicants’ skills profile (if you are hiring)! It takes a lot of work just to find the appropriate online learning resource. Just because applicants don’t have a sticker on their CV doesn’t mean they haven’t taken training in using a program.