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It’s a pretty good idea to have drywall corners, also called drywall beading. Drywall is a pretty brittle material and corners tend to be rubbed up against it often. Rather quickly, the edges will start crumbling and you’ll need to replace the entire panel, or add beads on top and repaint the wall. Drywall beads—which are inexpensive—provide long-term support for the drywall and protect your investment.

Whether you can reuse a drywall anchor or not depends on the type. Plastic expansion anchors and plastic self-drilling anchors, which expand once screwed into the wall, are single-use only. You can't straighten and reuse them after removing them from the wall.

Metal toggle bolts can be reused, provided you can successfully remove the toggle from behind the wall. Once you remove the bolt, the toggle often falls down and can be difficult to retrieve without removing the drywall.

Drywall can get wet and dry out without sustaining permanent damage, but only if the water damage is minor. If you have a small leak and are quick to correct the issue and set up blower fans and dehumidifiers, your drywall should dry out. If the leak is persistent, the drywall becomes totally waterlogged, or mold begins forming on the drywall, you should remove and replace it.

You may need to replace drywall because of smoke damage. If the drywall is covered in soot, you may be able to clean it, but it will require a lot of time and effort. You could spend hours cleaning the drywall only to find there is more damage and it needs to be replaced anyway. It’s usually easier and safer to remove the smoke-damaged drywall and replace it.