The good battery should have the positive jumper cable attached to the positive battery terminal and the negative jumper cable attached to the negative battery terminal.
Positive and negative car battery terminals.
That is why the negative terminal is called the ground terminal.
It is usually color coded black.
The negative terminal of a battery is connected to the chassis of the car and as a consequence it is grounded.
When disconnecting a battery the negative terminal is disconnected first to cut off the circuit and avoid a short.
The grounded terminal connects to a grounded source on the vehicle.
A negative terminal is the grounded terminal on a car battery typically marked by a minus sign.
It is only a safety issue.
The other terminal is positive usually color coded red or orange and marked with a plus sign.
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Jump starting a vehicle with a set of jumper cables is pretty easy.
I am assuming you are referring to installing a battery not performing a jump start.
Each battery has two metal terminals.
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One is marked positive the other negative.
While car batteries technically have the amperage to kill you the voltage is a different story.
Find the batteries and their terminals.
If you first connect the negative cable then when you connect the positive cable there is a chance the wrench will complete a circuit.
There are also positive and negative cables in the jumper cable set.
The red one is positive the black one is negative.
Never connect the red cable to the negative battery terminal or a vehicle with a dead.
And of course always reconnect the ground last.