There can be many opportunities and issues co-existing in the K-12 school system. As a teacher, you can make a bright career in this system. Learn additional skills that keep you prepared for the emergencies to save precious lives. This helps in boosting your teaching career through credentialing. In many American states, it is mandatory for the school teachers to learn CPR and AED techniques for helping the students in emergency situations. If you have previously enrolled in this course and you presently need to recertify, you can opt for online CPR recertification courses that can work around your busy teaching schedule.