HELP: How do I assess whether repair costs are fair??? Beginner – please be kind 😉

Dear community, I have had my first car for a few months. It came as it had to come, and the first car now has its first damage. So I drove to a workshop, it was determined what it was and calculated a cost estimate. I have now (as said 1. car) no idea how to assess the cost estimate. Can someone help me there? Concretely: I drive a Fiat500c 1.2v Built. 2011. It would have to be the wheelhouse shell at the front left and both front shock absorbers a The brake lamp at the rear right also has a mistake. The estimate is about 680€. If someone specifically tells me whether it is fair or how I can judge whether it is, I would be very pleased. Many greetings and many thanks in advance!