Ubuntu 20.04 has been finally certified for the Raspberry Pi 4. This article explains how to get it up and running.
I made a few tests to find out how to boost network transfer speed on Raspberry Pi 4 and is it worth the hassle.
A full guide on how to get, customize and install the latest Raspbian distro on a Rappberry Pi 4.
Docker and Docker Compose are convenient tools if you need to run some software without bloating your system with dependencies that you don't use on a daily basis.
It's a powerful beast but it may not work well out of the box