How do you know when there no bullets in the Glock?

To determine if a Glock is unloaded, first, visually and physically inspect the chamber by pulling back the slide to check for any ammunition. Ensure the magazine is removed and check its follower to confirm it's empty. Additionally, always treat the firearm as if it is loaded, following proper safety protocols. If you're unsure, consult the manufacturer's guidelines or seek training from a qualified instructor.