We all were new once, no one ever goes into anything new with all the answers. The first step in becoming wise it to know you are ignorant and need to learn so *bow to NancyBR*.
I was building a box mod and asked here for help, as well as asking my father (who knows a lot more about electronics than I do). It's better to ask a "dumb" question (no such thing actually) than to remain in ignorance.
There are a few different types of tanks and tank systems out there. The ones like this
one.... which are plastic or glass and contain a carto. And the
ones like this which are just a push-in to an atty.
Each have their pros and cons. I'm using the second type and tend to like them. however cleaning the atty every so often (I just did it for the first time tonight) seems like a bit of a pain in the .... since I didn't have my glasses on and had let mine go for over a month without cleaning it.
Thing I like about them is being able to vape for a while without having to fill up. Take enough drags (like having a cigarette) and set it aside for a while... Won't last me a whole day but no problem. If I have a tank set up I can usually drive and hour or two and not have to worry about changing things out.