In re-reading the thread I see I missed one of your questions. Sorry about that. The learning process I went through was reading every one of Battitudes blogs on battery safety. It really pertains to Mechanical devices, but it's good to know even if you use regulated mods exclusively. Ohms law is really just simple math and having a basic understanding of it helps the whole dynamic of vaping make sense. It is a little overwhelming at first, but once you put it into practice, it becomes very simple, trust me. I still meter out every build on an ohm meter, but after maybe 30-50 builds, I can tell you what my build will come out at within a .1 OHM. The nice thing is, once you build the firt RTA, you can build them all. Techniques may vary, but the concept is the same. You tube was also a blessing when learning to build. Watch them after you learn as well, you'll be amazed at how fast you get better than even the guys holding themselves out as "you tube experts" lol