Fixing a loose door handle depends on the age and style of your door's lockset—it is almost always an easy fix with very simple tools.
How to Tighten a Loose Doorknob or Door Handle: DIY Tips - BetterLocksmith
How to Fix a Loose Doorknob or Handle
Fixing a loose door handle
Guide to Fix a Loose Doorknob or Loose Door Handle
Guide to Fix a Loose Doorknob or Loose Door Handle
My Door Lock Is Loose
How to Install a Door Knob, door handle
How to Repair a Loose Doorknob
Zolunu Door Lock Repair Plate, Door Lock Reinforcement Plate, Door Lock Fixing Plate, Door Knob/Lever/Deadbolt Fixing Filler Cover Plate, Prevent Door Lock Loose or Wobbly - Black 2 Pack
How to fix the door handle. There's no fresh wood to screw into. Matchsticks won't work. : r/DIYUK
How to Fix a Loose Lever Door Handle
Remove door handle / knob without screws visible #3
How to Repair a Loose Door Handle Door handles, Door repair, Home repair