Learn how to install the NVIDIA Container Toolkit, which allows users to build and run GPU accelerated docker containers.
A really interesting presentation from Dylan Beattie on how email has evolved over time. He covers pretty much everything from how email started, the first spam email, how most SMTP providers are not true to the actual specification, and even touching on SPF/DMARC protection etc.
Learn how to add an application to your application finder by creating a "Desktop Entry".
Learn how to deploy and configure your own Bind9 DNS server through Docker.
Learn how to deploy your own Gotify server in order to subscribe for phone push notifications.
Learn how to move a column around in LibreOffice Calc without breaking your formulas.