I recommend Cronie, the behavior is similar to other distros you’re probably familiar with.

For easy reference, I paste these instructions into /etc/crontab

# After installing cronie:
# systemctl start cronie
# systemctl enable cronie

# After editing this file, you must set the changes:
# crontab /etc/crontab
# Check that the changes are set:
# crontab -l

# m h dom mon dow user command
43 8 * * * root . example.sh
# EOF