I am sure the answer to this simple and common question is buried in
here somewhere. But I can't find it. can someone help.

Since my maiin wifi router doesn't hit the front of my house, I am
tryin to extend the range of my home WAN.

One suggestion is to setup an access point to hit the front of the
house. I've read and followed the Netgear instructions to do this but
their example shows a wired connectino between the main wifi router and
the AP, and then the PC connecting via wifi to the AP.

This kind of defeats the purpose of things. I am trying to stay all
wireless and avoid having to run a long ethernet cable across the house
(or worse, pull it through the wall.)

can an AP communicate to a wifi router via wifi?

so, is it feasible to do:
A) PC >wifi to> AP
and
B) AP >wifi to> main wifi router ??
so all connections wireless?

many thanks