Fix Loose Joints With Epoxy Resin
Brush a layer of epoxy onto both parts to be joined. Assemble and clamp the parts if necessary. Then wait the specified time for the epoxy to set up. Read the instructions to determine how long the epoxy should cure before you use the furniture. Even five-minute epoxy may take an hour or more to reach full strength. If you're repairing a valuable antique, you may want to avoid epoxy repairs because the result is irreversible.
Fix a loose screw
This is an old carpenter’s trick. If you have a screw hole that’s too big, just wrap a bit of steel wool around the screw before you drive it in. It provides just enough friction to hold the screw firmly in place and takes less futzing than trying to fill a hole and re-drill.