CoRE - Get peer assistance here with setting up Pistons

Request for IFTTT Tutorial Please

Trying to piece this together is getting the users nowhere.

We need a solid STEP-BY-STEP (or very good outline) on setting up the following:
-what do I do with CoRE and IFTTT? What is the IFTTT condition in CoRE used for? Does it trigger something? Does it wait for a signal from IFTTT?
-how do I use Maker with CoRE?
-how would I retrieve a cell value in a Google spreadsheet and store that value?
-how would I send a variable value to a spreadsheet to a Google spreadsheet via IFTTT, Maker or otherwise

There have been several disconnected threads on the method of showing how to get the URL of CoRE. They are scattered about and I will paste those below. But the nuts and bolts of how are hard to understand and follow.

Thank you.
Alan