Warning lights on the dashboard

So basically to sum it all up there is a red warning light on my dashboard of a car with an exclamation point. To add more detail I am currently getting my car fixed and after the mechanic left today I had noticed some new lights on. Now I will not be be working with the mechanic anymore because of personal reasons. So I just wanted to know more about my car before I took it in to the shop, but I am currently unable to do because my car will not drive at all. So I have turned to the internet for help. (Which btw any information will be of great use to me, thank you!)Anyone know what it means?