Checking the amount of installed RAM and monitoring how much is actually being used is a fundamental task that anyone new to Ubuntu should learn.
Rufus is one of the most popular utilities for creating bootable USB drives.
On standard Ubuntu builds, Firefox is preinstalled as it’s the default browser.
The traceroute tool is part of the inetutils collection of network programs.
SSH is the standard method for remote login on Ubuntu, but it’s typically only used for CLI access.
LibreOffice is preinstalled on standard Ubuntu systems, but on minimal setups, you’ll have to install it manually.