Understanding the risk of staking. Looking for clarification.

I’m considering staking my eth, but I was wondering about the risk. If I staked 1 eth and it had a failed verification and lost money, you don’t lose all of the eth, correct?

Specifically, I’m wondering if when you lose out on staking if it means you lose all of the staked amount or just a portion.

The way I understand is that you risk your own stake in the coin to validate the network, so if a faulty transaction occurs then you are the one who is penalized, correct? Just wanting to understand the extent of that loss.