Can't move the light in render mode in blender

I am complete beginner in blender. Now I am learning the basics of rendering in blender. In viewport shading I can’t move the light as I press g on my keyboard. What’s the problem here?

dont know. works for me - maybe you can share your file?

Your camera looks weird too. The triangle is not above the frustrum. Try updating your drivers. One guy here couldn’t get a normal circle because of this.
Also, verify you are not in “Origin” manipulation. (“Options” in the top right of 3D viewport)