Need Help no power when key in ignition

[Ender]

My dad blew my main fuse by digging around with a screwdriver and shorted the 12+ terminal on the alternator to ground (which is the same as directly connecting the 12+ to - on the battery). I was so mad, it was my first day with the car and I had to leave it at their place overnight because the shops were all closed by then. I've heard that switching the + and - cables on the battery can do a lot more damage than just blowing the main fuse. Regardless, DON'T DO THAT and DON'T SHORT 12+ TO GROUND and this should rarely happen.