It feels too committal here. Black's centre is solid, but yours will be easily undermined later on via c5 or f6 etc. Your knight on c3 is also fairly useless. In general it can be bad to 'resolve the central tension' unless you have a clear plan or reason for doing so.
early caro kaan mistake?

its not bad if you had nf3 and bg5 which could cause serious threats but you wanna attack not defend and you dont have good follow ups.

The issue is that this move doesn't really hinder black much. Bc5 and Nd7 will likely follow, developing pieces and sidestepping/attacking the pawn without issue, and the queen has a clear path to get out and into the game. Meanwhile, white is still fairly underdeveloped.
Black could also do d4, kicking your knight and forcing it to reposition rather awkwardly, but I'm not sure if that's considered good.

Okay, I understand that the pawn on e5 will be difficult to defend, and even if I push d4, things could get messy after c5 or Nd7. Instead, I should keep the pawns in the center and push d4, for example, which also opens up the position for the bishop. Thank you!

The biggest mistake is in the title.
I hope you mean the spelling is the mistake and not the opening itself. That would make me very upset 😢.

d3 it's more solid. But there's something I don't like about your position Queen on f3 so early you allowed you're opponent to capture your knight with is light squared bishop by look's of it. I tend to avoid stuff like that.

The biggest mistake is in the title.
I hope you mean the spelling is the mistake and not the opening itself. That would make me very upset 😢.
Yes, the spelling, obviously.
There are three different mistakes in that spelling, which sounds almost impossible, but it's true.
A few moves into a Caro-Kann opening, is this really such a big mistake? I mean, what's the issue here? I'm just moving my pawn forward. 🤔 I can understand that there might be better moves, like d4, but calling it a mistake feels a bit harsh, don't you think?