Hello I need to work a practical PDF manual or video tutorial link to learn plumbing and gas or plumbing best regards my friends

Hello Plumbing you can learn via email if you want, I do not advise you the same for gas. Gas is a very sensitive issue where you have to learn how to calculate consumption and ventilation where life is at stake. It is not for adventurers without knowledge. My advice is that you enroll in a technical school that offers training courses and qualifying degrees. Regards