HELP NEEDED

So my boyfriend got his car back in 2024 and hasn't been able to fix anything or drive it since he got the car when he was on his learners permit.

He's been telling me that he has to jumpstart the car by connecting it to another car since he doesn't have a battery pack. He's told me his CV joint on his front left wheel needs to get replaced and a few other things too.

I don't know like anything about cars but I really want to learn so I can help him with his car and understand stuff about cars.

Anyway, so the main issue is that his car wont start without a jumpstart. When he puts the key into the ignition and goes to crank it nothing happens. Im going with him to have a look at his car but he thinks theres something wrong in the fuse box.

I've done some research and I think it may be something with his battery but he says he's charged it fully but doesn't have it under any insurance or warranty and doesn't know how old it is.

Would it be worth trying to start his car by putting my foot on the brake, put in neutral, shift into park then turn the key in ignition?

Any ideas or anything that would help is NEEDED and very much APPRECIATED!!