[chromic]

It depends on the screen. A cheap glossy screen might scratch easy, but something like a macbook screen probably has a pretty good anti-scratch layer. Glossy screens tend to get dirty easier, but also clean a bit easier with readily available materials (e.g. paper towel + water).

[ugh]

It’s glass – not easy to scratch, at least compared to plastic. That’s at least true for all of Apple’s laptops except the Air.