I have decided I want to learn Drupal. To that end, I fired up an AWS Lightsail server with a Drupal site, to play around with. Having taken AWS's default Drupal 9 install and logged in, it is displaying this message in the config screens:
There is a security update available for your version of Drupal. To ensure the security of your server, you should update immediately! See the available updates page for more information and to install your missing updates.
This default site is running Drupal 9.3.2, but apparently the latest security update is 9.3.3.
I can download the tarball, but how do I now apply this update without destroying my site?
I've been googling away, but there doesn't appear to be clear instructions that I can locate.