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Enterprises have no way of knowing. Your self-introduction is not enough, even if you have a certificate or other documents, you can't prove your hands-on ability. In addition, the skills that enterprises need are not necessarily within the range you know.

Pre-job training is normal, whether to play or not depends on the performance after training. If you meet the requirements, you will have the opportunity; If you don't meet the requirements, there is no chance.

Wish you success!