Destroy(this.gameObject) vs Destroy(gameObject)

I’m creating a space shooter game where the laser beam is destroyed when it leaves the camera’s fov. Both methods are doing exactly the same thing. So is there any difference between these 2 techniques?

No there is no difference. the keyword “this” simply is a way of the object to self reference. It’s typically unnecessary to ever use unless you have things like parameters in a function that match the same name as members within the object. I tend to try to avoid this and as a result almost never use “this”.