In the "olden days", lol, alot of ecigs that were cig-lookalikes, came in 3 pieces. They included a small stick battery section, in the middle an atomizer section, and above that the cartridge section. There was usually a small amount of filler in the cartridge section that you would drip a little juice onto, then place the cartridge on top of the atomizer section that had the coil in it. That did work decent enough to get people to quit smoking, but nowadays there are so much better ways and means to go about it. An EGO Twist is 2 pieces. It has the battery, then whatever you decide to put on top of it, whether an atomizer, cartomizer or clearomizer. I hope I haven't confused you. Also, nowadays, most people that do use an atomizer, just drip directly through the drip tip to the top of the atomizer and do not have the filler cartridges on top of the atomizer. Long story short, you as a newb would be better off trying a clearomizer or cartomizer to start off with.