Table Dive

So I feel more comfy with my dive shop now that I called them and got the guy who was interested in, you know, helping customers to talk to me about what the open water dive is all about. Because otherwise I was just going to cancel and go through another shop (see comments below).

From what I can tell, the whole thing where I studied how to read dive tables and calculate my pressure group based on how much time I've had in-between dives and such is completely irrelevant to the first level of open water diver. I can't understand why that would be true but apparently it is.