In the menus to the left I cover many interesting topics from VEEAM Community backup. Changing the screen colors in VIM to other colors. How do created DHCP, DHCPv6, and DNS servers in Ubuntu. How to create a SAMBA server. How to configuration SCP between servers without a password using keys. Information on UFW: Uncomplicated Firewall.
Many years ago my web site started on IIS on a windows workstation. I moved to Fedora because it was Red Hat. It was not easy to use and backup. I moved to CentOS because it was better designed for security but it got in the way of backup performance and copying pictures to it. I had both Ubuntu 16.04 and CentOS 7 on my WordPress servers recently. I dropped CentOS 7 because it was 33% slower on backups. The SELinux firewall was not easy to setup and modify. It kept getting in the way. MYSQL upgrades on CentOS kept crashing the databases and I had a lot of manual work to do.
I migrated both to Ubuntu 20.04 LTS. I usually don’t do in place upgrades to the web servers. I will create new ones and use duplicator in WordPress to migrate the web sites. This cleans the legacy junk files up.
LTS is Long Term Support: xx.04 version is Ubuntu is 5 year security and patch support. Every 2 years the new LTS version comes out. 2020 was the last one. 2022 should be the next one.