Learning My First Mac

So this might be the most surprising find yet: Apparently there is no native "full screen window" mode in Mac OSX. Not only does this mean that you can't quickly maximize a random program window, but you also can't move into full screen browser mode in Safari or Firefox (Windows users are used to hitting F11 to make all of the window frames and toolbars disappear when you need all of your screen space for browsing, screenshots, or slideshows). Instead of having a full screen mode Mac focuses on giving you what it feels optimally need, though this seems impossible to predict on many web pages. I've embedded someone's video below that illustrates how annoying this can be.
From everything I'm reading there are two options for fixing this problem. The first is to install an app called Megazoomer, which adds a hot key to fully maximize your active window. However, it doesn't remove the toolbars etc. when you're in a browser. To solve this challenge supposedly you Opera for Mac has a full screen browser mode. Together these two apps supposedly should get me to a feature that was built in on Windows, one that I found very useful often.