Theres not much to learn about VV mods. They make volts, you turn it up or down to suit your atty. They are more foolproof, and IMO beginner oriented.
Rebuildables are more in the territory of mechanical mods. Also, if you are going to be rebuilding attys, get a rebuildable atomizer. While you CAN rebuild a protank, putting the same effort into rebuilding a proper RBA will give better results. A protank is a disposable atty that CAN be rebuilt. Not a rebuildable atomizer.
The most you need to learn for VV mods, which applies to all mods actually, is basic (basic) electricity. Electricity is electrons flowing through a substance, literally moving along in a river, rivers have current, current is how much flows. Resistance (ohms) is how much the substance tries to stop the electrons, Voltage is how hard you are pushing the electrons, to get past the resistance.
More push (volts) at the same resistance means more current.
Less resistance (ohms) vs the same push, means more current.
Current means heat, as all those electrons rushing through the substance create "friction".
Heat makes vapor.
