First off find the model number of your router . Easiest way is to login to the admin of the router or modem whatever you use. If your having Troy les call your Isp they might have added their own special admin to the router. Once that's done look at his post and look at the settings in your router , you'll need to goto advanced setting. No you don't need a class just be a bit observant. Also get the distance to your Xbox / ps4 to your router don't make a cable unless you have the gear , but buy a cable that is the necessary length once you've determined the cable route. You might find a huge increase in playability by just installing a hard line/ Ethernet cable. Dmz and fort forwarding, plus the others are all standard settings within the router itself . Once logged in you'll see what he's saying . Do a quick search online as well there's tons of good tutorials with pictures and specific I modem/ router setups which will help a beginner .

Mostly its fancy words for sections already in your routers control panel. Have a poke about. My advise is to draw a picture of whats happening to your network traffic as networking is an extremely abstract concept Basics is port forwarding and fixed IP. that's all its been for the last 10 years of internet gaming

Take a networking class. It's simple, just 2 years for an associate's degree. There are other options; apprenticeship, call Geek Squad/ Best buy, YouTube, or a friend that knows this kind of stuff.