It appears that the default editor in Fedora comes up as nano. For those of y’all that prefer vim – here is how to switch that:

For systemctl edit

For a single user:

echo "export SYSTEMD_EDITOR=vim" >> ~/.bashrc

Systemwide:

echo "export SYSTEMD_EDITOR=vim" >> /etc/bashrc

For crontab

For a single user:

echo "export VISUAL=vim" >> ~/.bashrc

Systemwide:

echo "export VISUAL=vim" >> /etc/bashrc

Applicable to Fedora 32 and higher