Scratches on TouchScreen devices caused by fingernails, rings,  ,watches can make your screen all scratched up, and not perform as well. You can use a screen protector, case, and a bag to protect your touchscreen from scratches. In my experience, a case and bag is good enough to protect my tablet from scratches, and damage since I don’t wear hand or finger jewelry, so I’m not very likely to scratch my screen with my finger since I also cut my nails very short. It is also easier to use touchscreens when your nails are short since you do not have to worry about your nails scratching your screen, and your nails don’t get in the way of typing, and pressing buttons and links.
These tips I mention will make your tablet and other touch screen devices last a lot longer because they won’t be damage as easily from physical damage from scratches, falling objects, falls, etc when it is protected with cases or a box.
A case and bags will also protect your tablet, and phone from low drops if it is a padded case which can protect your phone and tablets from drops, bumps, and dents.
Cases and bags could also protect your phone and tablets from water from dropping or soaking onto your tablet or phone. A case and bag which covers your tablets whole screen and case will stop keys, pens, and sharp objects from poking, and scratching the screen, back, and side of your tablet, and you won’t bend your touchscreen if the case is a hard plastic or metal case if you fell down or someone bump into you.
Some Cases even has a hand strap for strapping your Tablet to your hand when in use to stop it from falling to the ground because the case is tied/strap onto your hand when in use by you, and when it is not in use, you just zipper up the case to protect the screen from the outside.