I wouldn't leave your learning up to him. If you value your face and even life, I would read up on it so YOU understand what YOU are doing and how mechs, batteries and coils are all married with a mech and not leave YOUR safety in his hands. At the end of the day if this friend of yours tells you something and you you put it into use and not read up on it and understand it, it's not your buddies face or hand being blown off...it's yours so if you value you digits, hands, face or even life I wouldn't put my trust fully in your friends because earlier in this thread you shared something and mentioned your friend told you that and what he told you wasn't correct. We are just here to inform you and try to help you not be a statistic that makes vaping in general look bad.
If I were you I would read up and UNDERSTAND how ohms law works (I will post a pic in this thread on how I learned ohms law and I keep the pic on my phone in case someone needs it wether on here or if I'm in a local B&M shop and someone needs it so save the pic I'm sending you), read up on battery amps (I'll also include a pic I got from Mooch on here (our own battery guru on ECF) and how a coil builds resistance have to be married to the battery using ohms law to be safe.
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