An RTA is a Rebuildable
tank Atomizer. Basically the tank screws off the base to reveal the build deck. They're fairly simple to build on for beginners. My first was the Vaperesso Gemini.
Alternatively, there are also RBA's (Rebuildable Base Atomizer) like the Smok TFV8 line. In an RBA, the base you build on is removed just like a factory coil. The size of the base will determine how easy it is to work on.
If you're just starting, find a decent coil building kit. I grabbed mine on Amazon for around $35. Came with needle nose pliers, tweezers, flush cut wire cutters, coil jigs, scissors and an ohm reader. Determine what your target resistance is and head over to steamengine.org and use the coil calculator to figure out how to wrap your coil. Once it's wrapped, it's a good idea to use your tweezers or a flat head screwdriver and gently scrape your coils, then install it on your mod, turn your wattage down a little and dry burn in short pulses. You want to make sure your coil(s) heat evenly and from the center. Dry burning also burns off any excess machine oil that might be on the wire.
After that, just wick and vape. Only took my about 3 tries until I had it all figured out. Never hurts to search YouTube for tutorials as well.
I'm a man, and I can change, if I have to, I guess.