Here's a way to help simplify it.
There are two main groups of oaks. White Oaks and Red Oaks (arguments about the placement of live oak is rampant amongst botanists.)
The white oaks have closed tyloses and the red oaks have open tyloses.
The white oaks have species names containing "white Oak", but also contains species of other oaks that don't have the name "white Oak". Burr Oak is an example.
Red Oaks have species names that contain "red oak" but not all red oaks are called "red oak" Water Oak is a red oak, for example. So is Shumard.
Be careful when talking of Oaks that you make the distinction between identifying one of the two (or three) "Oak Groups", or a species within that group. To speak in generalities (white oak) can make for a confusing conversation.
Steve Nix has a good page on About.Forestry with tree identifications on it. Steve is a long-time member here and spends a good deal of his time creating Forestry oriented articles. Here is a link to his
"Identification of Hardwoods" page.
You will notice that we share the same experts and you will receive good advice about tree identification, tree health and Forestry in general by developing a conversation with Tranger and Phorester, amongst some of our very own, here. Once in a blue moon, Steve will visit. I wish it would be more often. Check out some of the information he has put together and come back to tell us what you think.
You will find many "fly-by-night", self-proclaimed botanists and foresters on the Internet. The terms get used rather loosely and you have to be careful about listening to all the New and Great these guys profess to be the truth of life-long studies. Sites like Steve's and our own Forestry Forum rely on the education of truly schooled foresters, botanists and others educated in the natural sciences. You can generally rely pretty heavily upon their statements or recommendations. You will also note that they use documents created by the USDA, USFS and other Government agencies as their footnotes.
Perhaps one of these fellows will come on and tell us a rule of thumb for identifying the "groups" of oaks.

(well, i gave you some duplicate info that came in while I was typing this soliloquy, but I posted it anyway. DanG if I'm going to delete all of those hard-to-find letters)
