Repair-It

Powertrain
It's your engine, transmission, driveline

Exhaust
Manifolds to tailpipes, this can be quite exhausting

HVAC
You should know what this is. If not, you probably roll your windows down a lot.

Exterior
Got rust?

Interior
Fuzzy dice or LED bulbs are not a repair

Chassis / Brakes
It's pronounced "chassy." Brakes, suspension...things that make the car fun or a death trap

Audio
Sometimes repairing the stock system is ill-advised but you can do it

Electrical
Wiring, DIY, lighting, etc.