30 years experience as a mech ,my first concerns are safety .
ask questions ,your local mech will show details of what need to be checked .
boost boxes are a good way to start a dead car ,i included them as well as jumper start

Step 1: Safety First

eye protection only pirates look good with eye patches
hand protection use latex gloves like medics do
electrical protection short piece of broom handle
Acid protection >Baking soda (I store it in a m&m mini tube remove M&M first )

Step 2: ID What Is Under the Hood

Where is my battery?
Under the hood might have a dust cover on it (owners manual )
important parts of the Battery?
Almost all battery's (even maintenance free) have a cover to check/add distilled water
a âDRY â battery can explode
the Post (what cables attach to) one marked with â + â one â - â
the + or positive one is hot/red
Cables (most) one is red one is black
Black cable other end from the battery is it bolted to the motor?
Take the time to look for the belt on the motor
is the belt on the pulley? Is it lose?
The modern flat belts last many miles but when they break everything stops

Step 3: The Running Car

Jumper cables are always too short
check where both batterys are so cables reach
EYE PROTECTION &gloves
short broom stick to keep tangled cables from arcing
identify the Positive post â + â clip the red Jumper cable to it
it does need a good connection
black Jumper cable clamp goes to â - â

Step 4: The Dead Car

now its gets a little different
the black Jumper cable clamp goes to where the cable is attached to the motor
most important to ground the motor to the jumper cable
it has to do with not arcing the dead battery (yes it can explode)
then the red Jumper cable gets clamped to the â + â Positive post

Step 5: What Is a Boost Box?

this is a battery in a nice case with a wall plug to keep it redy
they work best when the dead car is not completely dead .
they are nice and cost less than a wrecker will charge to jump you.nicer ones even have air compressor to inflate a low tyre.