WhT is trick with the ground and white wires? Is there a rule or a drawing that you could share about how to isolate the grounds? CWH

No real trick, The Ground connects to all exposed metal parts, junctions, boxes, and doesn't carry loads. The Neutral does, You also need GFI protection. Should understand completely or shock and/or death could occur.

This page may help:
Wiring a Hot Tub - Electrical Installation and Wiring Diagrams

The G.F.I has to be rated to the amps you are going to carry on that circuit and once you go through that G.F.I. The other outlets will be G.F.I. protected when wired correctly and grounded correctly