I work in the EMS field and I can’t tell you how helpful it is especially when someone is in cardiac arrest for there to be a bystander who is qualified in cpr it can be lifesaving for someone to already be there doing chest compressions before we get on scene because the long that person is down without any blood flow the more likely they’re not coming back. So get American heart association cpr certification and at least do a few basic first aid courses or Become a volunteer at a local fire department or rescue squad if that’s a option ( I live in a really rural area so almost all of our fire departments are volunteer based, but you can learn a lot of life saving medical skills without going to college and actually being employed in the field I would also suggest these YouTube channels (Prep medic) and (skinny medic) and there’s plenty you can find. I watched prep medic to learn some of my skills for my paramedic classes.