I would like to clarify a doubt

I recently acquired a Jump-Starter system and in the manual mentions a terminology about the way of connecting.
He mentions a system with a ground and system with a positive land, someone could explain what each of the 2 terms means, for your attention thank you very much.

This "terminology" refers to how the electrical system in the car is connected.
But the correct way to connect it is positive from the Jump-Starter to positive of the car
and negative of the Jump-Starter to the ground of the engine.

Motor land is any metal part
recalls:
positive = red cable = (+)
negative = black cable = (-)