Hello Gregg,
welcome to Wikitree. This site is unique. No other genealogy site is like it.
First, there is only one tree. Yes, we share the same ancestors and we collaborate to make WT better and better everyday.
This is why it is important to look around, read some help pages and get used to the site to get the feeling of the community. And as days go by, you will meet wonderfull people who care about our big tree, our ancestors and the sources to support the information we post.
Enjoy your journey on Wikitree