Stat545.com is a website based on the course offered at the University of British Columbia, and it covers a good variety of R programming tasks with the exception of statistical modeling and inference.

Jamovi is an open-source project built on top of R that gives users a graphical interface similar to SPSS or Minitab.

Where do I find datasets to work with?

Posit (formally Rstudio) has a repository of “Cheatsheets” that can guide you through many different frameworks in R.