Parts of the Guitar
It is true that parts are parts, but it is not true that all parts are created equally. Quality speaks. You should be able to differentiate among the different parts of the guitar. There are tuners / machine heads, string retainers, head stock, nut, fret wires, fret markers, pick guards, strap buttons, bridge pickups, neck pickups, tone knobs, the neck, and others. Be familiar with your instrument.
The innards are a different matter and require searching for information elsewhere.