Hi there!
I’ve also been on a similar quest to yourself and started to learn a bit of R (actually way more fun than it sounds, so satisfying).
There’s a fair few online resources, but I recently saw these two interesting ones which are free(ish) if you do them quickly, and nevertheless cheap if not. (I haven’t used them yet, have been piecing stuff together from YouTube lol but I think coursera is a pretty cool resource)
Imperial offers this:
https://www.coursera.org/learn/introduction-statistics-data-analysis-public-health
(For R)
John Hopkins offers this:
https://www.coursera.org/learn/systematic-review
Hope that helps :)