RealPython has some good stuff and is worth checking out. No, they didn’t pay me to say that – I’ve never made a dime for any such plugs (not that I wouldn’t take money , I’d just disclose that I did).
Here’s the link: https://realpython.com/free-courses-march-2020
Not sure how long this will be available, so check it out soon.
There are many sources of course work for R and other data science topics. I haven’t tried Business Science but it’s hard to resist free. Even if you already know the stuff it can be useful to have it presented from another perspective with different examples, especially if you don’t use it very often and are subject to getting rusty.
Yeah, they’ll pitch paid products at you – they *do* have to make a living.
So check it out here.