I always forget the syntax of ufw rules, and the command doesn't give detailed help. The following rules were mostly taken from the DigitalOcean link below.
https://www.digitalocean.com/community/tutorials/ufw-essentials-common-firewall-rules-and-commands
allow from 203.0.113.0/24 deny from 203.0.113.100 delete allow from 203.0.113.101 status numbered delete 1 app list ufw allow “OpenSSH” delete allow "OpenSSH" allow https allow 22 allow proto tcp from any to any port 80,443 allow from 203.0.113.103 to any port 3306 allow from 203.0.113.0/24 to any port 5432 deny out 25