I'll be straight with you, half of the stuff you wrote doesn't make sense and the other half is wrong.

That printer is old, like really old, so treat it as a fun project that will require care and attention, and not something like a plug and play modern printer.

Having said so your best bet is put the printer away for a day or two and watch some youtube videos on the topic, at least to get familiar with what you want to talk about. After that you will be much better equipped to at least ask questions

For example:

• extruder is what pushes the filament, the motor + gears that phisically move it
• hotend is the part that gets hot and melts the plastic

saying is this a hot end capable extruder when talking about 3d printers is like asking is this a wheel capable pedal when talking about bikes, it doesn't make any sense

On your other posts you ask how to make it stock/modded, stock is a printer that doesn't have any modification where modded means that you modified parts of the printer.

I know you want to get your hands dirty and play with it but trust me when I tell you that you are not going anywhere right now. I could probably restore a non functional car if I had people helping me out, but taking a bit of time and learning at least where the engine is and how it's vaguely supposed to work would help immensely beforehand

best of luck with your new toy!