What is The Difference Between Collider and Trigger and There Work
Use colliders whenever you want a collision to happen. Solid walls, characters, props, anything that you can physically touch.
Use triggers if you want to detect a collision, but don’t actually want collide with anything.
Triggers can’t collide with anything, they can only trigger something if a collision were to happen with them. Use triggers for things like proximity sensors, or anytime you want to know when something is in a particular area (at least one of the he acting entities must have a RigidBody to trigger).