Is it okay if I drop my SLR camera?

It’s generally fine. Whether it is a zoom lens or not, it may sometimes affect the telescopicity of the lens.

Single Lens Reflex Camera, also known as SLR camera. It refers to a camera that uses a single lens, and the light shines on the reflector through this lens, and the view is taken through the reflection.

The so-called "single lens" means that the photographic exposure light path and the viewing light path use one lens. It is not like a rangefinder camera or a double-lens reflex camera that has an independent lens for the viewing light path. "Reflection" refers to a flat reflector in the camera that separates the two light paths: the reflector falls down when viewing the view, reflecting the light from the lens to the pentaprism and then to the viewfinder window; the reflector quickly lifts up when shooting, so that the light can shine on the film Or on the photosensitive element CMOS or CCD.