Thanks for the feedback. I'm a Mac Pro. If you need help just reach out here or in world. When you have an application go full screen it will completely take over your screen. No Dock, nothing. Just the app. You can press down COMMAND + TAB keys together and it will show you all the apps open. Keeping your finger pressed down on the COMMAND key while tapping the TAB key will cycle through the different apps you have open. I would try going into SYSTEM PREFERENCES and looking at the TRACKPAD settings. You'll find GESTURES. Place you cursor over each one and you'll see an animation of what it does. There's a swipe one which allows you to swap between different screens. The MacOS allows you have multiple desktops. You can have Safari on one desktop, Word on another, Photoshop on another and Firestorm on another, all running at the same time. RAM is your only restraint. RAM limits the effectiveness of how many applications you can have open. The more RAM you have open the more applications you can run at the same time.
I hope this helps