What are the most popular part time jobs for young people?why? minimum 5 zdań !

The most popular jobs for young people, for example shops. but it is also meets the young people in a fairly rare occupations such as welders, this work is reportedly very profitable. Working young people depends mainly on their education. Some have a university degree and some low. However, those with relatively higher have better work. For example, will be master of, and the like.