You would be mad not to put Ubuntu based distro at the top of your list first. Arguably widest hardware compatibility, software availability & tech help.
Lubuntu for lightest, simplest. Xubuntu for a bit more full featured. Kubuntu 17.04 for beautiful full desktop environment but still good resource usage. The Gnome versions are too heavy on resources, avoid.
If you're technically skilled you may of course just install the server version of Ubuntu 22.214.171.124 & run it headless.
Check your hardware for compatibility.
Fedora : newer application packages but much heavier on resources than other distro's & reputation for beta type instability. Not recommended for most folks.
Manjaro : Very up to date core system & applications. Excellent stability & out of box experience. You fore go easy access to peripherals drivers such as printers/scanners as most manufacturers do not provide their drivers in a form for Arch based Linux distro's. Some are packaged by volunteers.