@rstats In case you haven't seen it yet: Due to the Corona crisis #Springer publishers provide several #rstats books for free:
https://link.springer.com/book/10.1007/978-3-319-72347-1
https://link.springer.com/book/10.1007/978-1-4614-8687-9
https://link.springer.com/book/10.1007/978-1-4939-2122-5
https://link.springer.com/book/10.1007/978-3-319-46162-5
etc.
