That's fair, the quiz really is heavily based around the world of DnD, and doesn't make that much sense out of context.
> Like….. what are the limitations of the world? Am I strong… or capable of doing magic? Am I both? Do I have a weapon? If I'm invincible what does it matter what I do? I'll just bat my eyes and they'll all die….. roll a 4 or higher…..
The limitations on the world are relatively lax, and in practice it often comes down to the dungeon master's discretion, but the fundamental idea behind character creation is that you're creating an adventurer, not a hero or a protagonist. Basically, you get to do cool stuff, but everything you do comes at a tradeoff, and bad things can happen to you just like anyone else. You can technically wield supernatural powers and weapons at the same time (Clerics and Paladins do both to varying amounts), and you'll get to do cool stuff of your own, but that doesn't mean you get to do everything other casters or fighters can do, especially since most classes tend to run on their own systems.
The Shaman class, for example, is a caster class focused mostly on nature- and spirit-based magic, as well as combat with staves and their bare hands. An advantage over most traditional casters is that they can cast spells quickly and spontaneously (Sorcerers, by contrast, need to prepare their spells at least one day in advance), and tend to have spirit companions to assist them. On the flipside, though, the Shaman also usually takes a fair amount of damage in combat, and needs to possess sufficiently good constitution in order to be able to both cast their spells and learn new ones. You ultimately become resistant to aging and non-magical damage at a high level, though at that point most other classes also gain protagonist-grade advantages (they're also not as overpowered as they sound, since magical attacks aren't usually that rare).
> Is there a certain mindset I should be using to take this quiz?
Not really, except perhaps try to see what the implication is behind the answers, instead of taking them literally. You don't need to know exactly what each listed spell does, but it helps to know what are Cleric-type spells, Barbarian-type abilities, etc.