It's not quite that bad Susquatch, infill is the amount material between surfaces and comes in/ printed in different patterns, honeycomb is another of many. Lightens the finished product and doesn't use/waste material/plastic where it not needed, and speeds up the time to make the finished product. Gyroid is an infill pattern/design, % is the amount of infill, thicker walls on/in it and or a smaller honeycomb hole size, eg, more walls, smaller holes, stronger. But longer to print, and uses more material.
The "technobabble" is the hard part, as is any new field to be dropped into, as I think you have an understanding of CAD and maybe? use it a bit, in hand with the automotive background, it maybe easier for you then me. It also seems the lastest, greatest printers are closer to push button. You still need to design/draw what you want, or pick something from a depository, convert that to a file the printer can use, some depositorys can do that/ or have it in the nessicary file. Shoot that to the printer. Decide material to use. Some of these newer printers will program itself for the material you are using, ( not sure what else, maybe coffee, strong too??). And press the start button.
I think mayhaps you already know a bunch of this. My problem is the drawing of things in a program, a very big PITA for me, and not sure of a few changes to be made in the printer programming as I have a new and very different print head on it, it does print, I don't want to make it not print!
Start simple, small steps grasshopper!
Winter is maybe a time to get a printer, learn it and about it. They are in some ways amazing and a pain too. But in hand with laser cutter and welder, anything "maybe" possible.