How to hang a frame with a sawtooth hanger from a wall?
A nail with small or no head - like a finish nail - would have to be at a 45-degree angle in order to hold the picture without it sliding right off.
A nail with a relatively large head - like a common nail - can be hammered straight in.
Screws can also work well, and let you easily adjust as needed. Wood screws are technically &quot;best&quot; for this, but a drywall screw will work just fine in most cases.
Note that a small nail or a picture hook is designed to go just into the drywall and hold a few pounds. If you are hanging something heavy (e.g., a big mirror), then you should find the studs and use a longer nail or a screw through the drywall and into the studs so that the stud is supporting the item, not the drywall.