Can't figure out how to switch between open documents in Pages
A bit of background: I've owned an iPhone for years now but just barely bought my first Mac (MacBook Air) a couple of weeks ago. I'm finding there are things that I could do easily on a PC that aren't intuitive on a Mac - I'm sure I'll get there eventually but right now I'm finding weird things are tripping me up.
Something I haven't been able to figure out yet is how to keep multiple documents open at the same time in Pages. I use keystrokes all the time instead of my mouse to switch between documents, applications, whatever I have open. Well, when I hit Command + Tab at the same time to switch between two documents, the Mac only gives me Pages as an application and no way to switch between documents. I hope that makes sense. I did some searching and someone suggested clicking Command + + (Command and the + key) to switch easily between documents - that did not work. That made the font size larger on the page, lol.
I know this seems like a small thing but I'm going to school online and it's something that I use multiple times a day. A way to do it easily would be much appreciated.
Thanks!
Havilah
PS How do I figure out what version my operating system is? I'm assuming it's the latest since I just bought this a couple of weeks ago from Apple.com but I wanted to verify that. Sorry for all of my newbie questions!
MacBook Air