MacBook Air 13in Screen
I spilled water on MacBook Air then the screen started having some lines and glitches I tried to fix it by restarting it but then the screen went black
Unfortunately, it sound like the water entered into the notebook's display or inside the notebook's chassis itself. Regardless, it will need to be looked at by an Apple technician.
At this point in time, to prevent any further damage, stop using your notebook and keep it powered off. Then make arrangements to get it serviced. To get started, try here: Check Your Service and Support Coverage - Apple Support
Then, go here: Contact Apple for support and service - Apple Support