Separate management of applications and windows is a powerful and underrated tool in my opinion. Once you become accustomed to it, the Windows style of a big vat of random windows feels like a chaotic mess in comparison.

I've been using a Mac now for about a year, and I still don't know if I can move windows around in 'Mission Control' or whatever it is where I see all my open windows.

Like, when I swipe three fingers up and see all the open windows, my current window flys to a random part of the screen and all the other windows appear. I can't move these windows, much less get them to stay in an area to find easily later. Is there something I'm missing? I am learning to like other parts of the interface, but this just baffles me especially when I have 20 browser windows open.

Or is there an app that helps with this? I find there are tons of app and tweaks that, as a new Mac person, I have no clue about. I don't even know what I don't know!

Yeah agree here. It makes sense to have a shortcut to only cycle over the windows of the same app. In the example where you have 5 windows in an editor.. how nice that you can only cycle over those instead of also the other 20 windows you have open

If you're looking for another not-very-discoverable shortcut that's quite useful... press Command-Tab until you get to the application you want, then without releasing it press up (or down). You'll get the exposé view for the selected application's windows. While that's open you can arrow between them to select the one you want or type to select by window name.

It's right next to tab on most keyboards, so I would call that discoverable.

Only if you're using a US keyboard layout.