The abs light came on on my 1996 pontiac sunfire then the airbag light came on 2 km's later. once we parked and tried to turn the car back on after turning it off, the engine wouldn't even come close to starting. completely dead. there is a puddle of clear liquid that isn't oily, near where the brake pedal would be under the car

SOURCE: check gauges light

Possible bad guage, bad wiring, or bad sending unit. Check each one independently of each other, start with wiring first, then sending unit.

SOURCE: 1997 pontiac sunfire - locked in drive but wont move. No shift.

check the linkage on the transmission it could have broke or just simply came unhooked

SOURCE: airbag and seat belt light remain on when engine

There is a sensor in the seat that senses someone in the seat. It might be bad or have a loose connection

SOURCE: abs and traction control light faults after a brake job. 2005 Pontiac grand prix

You have a bad sensor at one of the tires that need replacing that operates ABS and traction control. If you take it in to a shop it will run $130 but they can find which sensor is causing the problem. But if you do it you might have to replace all 4 sensors to make sure you got the right one. Every hard to diagnoses. Its better for the shop cause they can get electrical read outs for each sensor.

SOURCE: Where can I find the airbag sensor location on a

When it comes to any airbag parts,you are best to let someone who knows what they are doing, do the repairs.
The airbag system can be dangerous if the incorrect procedures are done.For example: if you have the steering wheel off,and do not pay attention to the position of a certain part,and reinstall the wrong way,,,,,,, when you turn the ignition key to the on/start position,the airbag may deploy causing harm to the person(s) in the vehicle.
Please take my advice and have a pro do the repairs.