Please don't take this as patronising, but there should be an owners manual with the car and that has a list with pictures of dashboard lights/meanings. If not, then google is your friend. Posting a picture would have helped too.
You can also find copies of owner manuals on Fiat's own web sites. Just involves putting your VIN number into the system.
Warning lights are colour coded.
Green are information.
Yellow are warnings, keep aware, do something about it soon.
Red are urgent warnings. Do something about it, NOW, or sooner.
The odd one out, blue, main beam. Or an emergency vehicle.