Have you ever received on-the-job training?
Bottom line, tarot reading suggests that while you may not have received proper training on the job, you have still found success in your field due to your prior knowledge. The most appropriate advice is to keep learning and try to improve your skills and knowledge by broadening your education. The answer to the question seems to be No, because despite not having received specific training on the subject, he still achieved good results in his work thanks to the acquisition of previous knowledge.