Apprenticeships are a type of on the job training. An apprentice is set to a strict training program to build the skills and knowledge towards the career they plan to pursue. As an apprentice you will spend many hours in hands on learning. Some programs require you to take classes as well but most of it will be on the job. Nearly all apprenticeships offer a wage and some may guarantee a job when finished.
Volunteering is a great way to gain experience towards your field of interest and to learn more about yourself and your interests. It is also a wonderful way to build your networks, making it easier to find jobs. For those who do not have previous work experience it is a great way to build up your resume.
The gap year is the first year between completing high school and starting college or university. Many students use this time to prepare for the following year and look for a job, a place to live or explore other opportunities, like volunteering or go traveling. Some people worry that if you take a year off from school you won't go back. However there are many opportunities that can present themselves when one is in a gap year and so it's also important to be open to the unknown.