iptables for dummies please?

Let's say these are the first five iptables rules. Can anyone tell me if my explantion is wrong?

Chain INPUT
num__target___ prot__opt__in____out __source______destination
1 ____ACCEPT__all ___-- __tap22 _any __anywhere____anywhere
2 ____ACCEPT__udp__-- __any___any __anywhere____anywhere___udp dpt:www
3 ____ACCEPT__all___-- __tap21 _any___anywhere____anywhere
4 ____ACCEPT__tcp___-- __any__any ___anywhere ___anywhere___tcp dpt:https
5 ____logdrop__all___--...

iptables for dummies please?