Welding courses

Which certification do I need to choose to get a welding job? I have completed my schooling and I decided to choose welding as my career but when I went for the interviews, they are asking whether I had done any certifications for any particular field. They asked me to get certification course and I am confused about it. I have seen a list of courses http://weldtechtraining.com/welding-courses/customized-welding-courses/? but confused in choosing one. Which course should I choose?What about stick welding?