Chain of inaccuracies?

So lately I'm finding myself in positions that seem very "fragile" and any inaccuracy can mess up the game pretty easily. This is one example where I'm playing as black.

What chess principles do you see that can be applied when reaching a position like this?

In case you want to see how I messed up, this is it. The position was getting tighter and tighter with every move, and I think there was no blunder.. it was a chain of inaccuracies, and this is what I'm lately finding in my games. A slowly damaged position that leads to a loss.

Any advice?

Up

The problem is the position you want help with is a bad position which has mistakes from both sides.

4.Nc3 is bad move from white.

White can play 4 different moves in that position, but Nc3 isn’t 1 of the moves.

White can play Ng5, d3, d4, or c3

Those are the 4 main moves.

The move Nc3 is an error because you can play the center fork trick.

Doesn’t matter what variation white plays above.

They are all good for Black and White isn’t supposed to play that way.

———-

Even if we ignore the above example showed, you still made more mistakes in your game.

At move 7, your opponent jump his Knight to d5, but the knight on c3 was only defender of e4 pawn so when he jumped into d5. The e4 pawn could of been taken.
If you was to play new player, I would hope you learned from your mistakes above and not make same ones again and if that is true. Than their is no need to look at your original position which you posted because it will never happen again.

@1

"any inaccuracy can mess up the game" ++ Inaccuracies do not exist.
Either a move worsens the game state won/draw/lost, or it does not.
If it worsens the game state, then it is a mistake.
If it does not worsen the game state, then it is not inaccurate.

"I think there was no blunder" ++ The losing side made the last mistake.

"it was a chain of inaccuracies" ++ No, it was one decisive mistake.

If it's not accurate then it's an inaccuracy. Wtf