00:10 - install R (RStudio web page) NB RStudio is an interface (IDE - Integrated Development Environment)
https://posit.co/download/rstudio-desktop/ 01:40 - path to R installation - multiple version installations
03:00 - activate R in QGIS using the "Processing R provider" PLUGIN
05:10 - install "QGIS Resource Sharing" plugin to add more R scripts
06:10 - bypass "QGIS Resource Sharing" problem to download the scripts by manually downloading scripts
07:20 - copy/paste r scripts downloaded from the QGIS Resource Sharing plugin repository into your profile folder path.
09:10 - after adding r script in the folder "<profile folder path>/processing/rscripts" you have to refresh all processing modules by opening/closing the options panel
11:45 - name and group definition in r script for QGIS
12:10 - header in r script that is read by QGIS
13:00 - run the "barplot" script and check results