The usefulness of R is due almost entirely due to all the packages available. These are what make complex tasks quite easy to perform. However, there are hundreds of packages, with new ones being created all the time.
Talk with colleagues to find out which packages are used the most in your field.
To quickly get started, install jmv and summarytools to install many of the most common packages (other packages it installs are called "dependencies". The tidyverse package is also good to install, but it can take a long time. RStudio will ask you to install packages as needed.
Specific packages that are not installed with the above that are good include stargazer.