There are various issues that arise during medical emergency. It you are not trained in providing first aid you can cause more harm than good to a patient.
There are various types of organization in market that claim to be offering first aid training to people but they short of quality. You need to understand content of a particular course to hone your skills.
You can help people when they face medical issues by using certain techniques and methods. There are various equipments which are used in combination to save precious lives of people.