Various trainings and courses can help beginners a lot in gaining common penetration testing skills and getting a good organic understanding of a penetration testing workflow. Of course, there are also some specialized advanced courses for experienced professionals who want to go deeper into particular dedicated topics.
Such training programs offer their attendees final exams and certifications, which can prove that they have learned courseware and are able to successfully use their acquired skills.
Moreover, some companies that order penetration tests require a penetration tester to have some proofs of his qualification including related certificates. Taking all that information into consideration, you probably should think about getting appropriate training if you are going to work as an ethical hacker seriously. So, let's provide some options and review several applicable certification programs.