Welcome, this is the second time I rebuild this my personal website for recording some tips and documents.
After by hacked yesterday, I realize that your host will be hacked in some day whatever process the host running or however the host providing service.
Some article I lost:
sed, awk usage
iptables, ipset, pfctl, netsh advfirewall firewall
dhcp failover configure
trap usage in shell script
manage deamon with supervisor
syslog date different from machine time and python import date module