What do all those networking terms mean? Network nerdery for dummies

Making sense of those acronyms and abbreviations. "Hey, man. Did you hear that Qualcomm's new X20 modem is rated for cat 18 LTE, carries 12 spatial streams and is 4x4 MIMO capable? Isn't that cool?" Maybe that's cool, but really how is a regular person with a regular job or who goes to regular school and has regular hobbies supposed to know? It sounds like a secret code with all the abbreviations and acronyms, and the companies who want us to buy it aren't any better at explaining: "10 times fas...