ufw cheatsheet

Why does Linux have such a wide array of different firewalls? Have to make cheatsheet for every single one of them...here it is the ufw one:

Conf files:
/etc/ufw/user.rules
/etc/ufw/user6.rules

ufw enable
ufw disable
ufw show added
ufw status verbose
ufw status numbered
ufw allow 22/tcp
ufw deny 22/up
ufw delete deny 22/udp
ufw delete 2
ufw allow from 192.168.2.0/24 to 192.168.2.25 port 22 proto tcp
ufw allow from 192.168.2.0/24 to 192.168.2.26 port 22 proto tcp
ufw allow from 192.168.1.155 to any port 22 proto tcp
ufw allow 80/tcp comment 'accept Web'
ufw allow 443/tcp comment 'accept HTTPS'