So I read this post: How do you help players not focus on the rules? and I can of course see the point that story is the main source of fun.
I would like to ask the opposite question though: what if a player (especially in a party of new people) tries to abuse "story over rules" to just avoid learning the rules? How do you deal with it without being rude?
Example: in our party of new players (i'm new too) we had a lot of conversations similar to the following.
DM: "you can't do that";
Player: "oh i'll 'just' do (thing that makes even less sense) then"
DM: "you can't do"
Player: "how does that even make sense with the story though that I can't even cast spells as a wizard/command my animals as a druid/etc."
We would then correct a mistake that a player made in his choices earlier (i.e. it happened to me once that I forgot to put clay in my initial inventory as a druid. I could then not cast "Stone Shape" and we decided to add it to my inventory in retrospect because it's quite a reasonable thing to have as a druid/not expensive and I just forgot to have it).
Later this stopped happening except for some people who just never spent time on reading up notes etc. This is the people I'm asking about. It's probably something that would wear out with time anyway, so I guess I'm asking for advice on how to speed up that process.