How do you install car seat covers with hooks?

I’ve jumpstarted my car battery several times over the last several months. When I check the battery power later, the meter shows it’s only at 70%. Can you tell me why my car battery won't charge past 70?

My Hyundai Veloster has been having some issues lately and my mechanic told me I have a failing catalytic converter that will need a full replacement. My dad has always been good with cars and he told me he could replace it if I just bought the part. How much does a catalytic converter typically cost?

I carry a lot of odds and ends to and from work in the passenger seat of my car (books, cases of documents, etc.). It’s heavy enough that it sets off the seatbelt alarm in my car, which is annoying. How do you turn off the seatbelt alarm on a 2021 Toyota Corolla?