Welcome
@MotherOfCats 
(I am also a Mother of Cat

)
There's a decent "Stepping up to the next Vape" discussion (as well as a lot of other good info) here:
Baditude's blog | E-Cigarette Forum
Give those a read - it might help with all the overwhelming amount of information that's out here now.
I started vaping seriously about 16 months ago. Started with Spinners and EVOD tanks. I kept dipping my toes in the water after reading what others were using. The available offerings have grown exponentially in the past 6-8 months.
I try to break things down as simply as possible
Form Factor - do you want a "Stick", a "Tube" or a "Box"?
Batteries - do you want to replace them (and recharge) or do you want them internal?
Tanks/Toppers - do you want a volume of liquid (tank) or do you want to add little bits at a time (RDA/Dripper)?
Tanks/Toppers - do you want to replace with a pre-built/stock head or do you want to rebuild?
Tanks/Toppers - do you like a tighter draw (more like a cigarette) or do you want an airy draw?
Once you start honing in on the "simpler" choices, then you have to explore battery capabilities to go with the topper (again, good reads in Baditude's blog articles)
I'm now sitting on a couple of iSticks (30 & 50), a couple of iPV Minis (original and V2) as well as ProTanks, Nautiluses, Kanger Subtanks, a couple of Kayfun clones and a handful of RDAs.
My daily setup is either a Nautilus or a Protank2 on an iStick (best portability for me). When I'm at home, I may be futzing with a build in a kayfun, Subtank, or an RDA.
It's a journey, for sure, if you feel that it has to be. I successfully quit smoking with a Spinner and an EVOD. I have only "upped my game" because I'm curious and I want to try new things. Many others are still running with the same setups with which they started. Try to think about what you want to achieve with your vape, and then it's less confusing
