A lot of thing I picked up I learnt from when things went wrong, the usual thing like no vapour, flooded
tanks,
coils not firing properly.
I learnt about
coils and wire to save money on factory kanger coils (the really old ones that could be rebuilt)
Batterys and ohms law was when I moved onto mech mods.
Products I learn because of my shinyitis (the need to buy shiney things)
You'll pick it up as you go along but as long as your here on the forum we're here to help if you get stuck, we've learnt it all so you dont have to