Novice needs help

Can someone please explain what these router commands mean? Thanks for
your help.
ps: my comments are preceded by ###
Using 1165 out of 29688 bytes
!
version 12.0
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname Corp-WAN
!
enable secret 5 $1$Hfy0$HVtYn6SGr01RgJHPW33ZG.
enable password 7 025701431B030C355946061400
!
###????
ip subnet-zero
### DNS
ip name-server 141.155.0.68
!
!
!
!
interface FastEthernet0/0
ip address 192.168.11.253 255.255.255.0
no ip directed-broadcast
ip nat inside
!
interface Serial0/0
ip address 192.168.254.1 255.255.255.0
no ip directed-broadcast
shutdown
!
interface FastEthernet0/1
ip address 192.168.5.2 255.255.255.0
no ip directed-broadcast
ip nat outside
!

###???
ip nat inside source list 2 interface FastEthernet0/1 overload
###map 192.168.11.63 to 192.168.5.63 and so on
ip nat inside source static 192.168.11.63 192.168.5.63
ip nat inside source static 192.168.11.13 192.168.5.13
ip nat inside source static 192.168.11.61 192.168.5.61
ip nat inside source static 192.168.11.58 192.168.5.58
###?????
ip classless
### send all outside traffic to 192.168.5.1
ip route 0.0.0.0 0.0.0.0 192.168.5.1
###????
no ip http server
!
###????
access-list 2 permit 192.168.11.0 0.0.0.255
!
line con 0
password 7 0055161E145E08121A2943430C
login
transport input none
line aux 0
line vty 0 4
password 7 0055161E145E08121A2943430C
login
!
###???
no scheduler allocate
end

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