black file after rendering

Hi , after the rendering of my work the output of the image file is black, how i can resolved it?
thanks

Too little information. Please ALWAYS supply a demo blend file for review otherwise we can only use guesswork
Since you did not supply a file we cannot check these so you’ll have to do so yourself.
The initial thoughts that come to mind:
Check you have lights that are set to be renderable
Check you have no hidden objects that block the lights or camera
Check you have nothing in the sequencer than overrides the viewport rendering
Check your render layers are set up correctly
Check any modifiers / constraints are set up correctly
Check your materials are set up correctly
Check your render settings are set up correctly
Check any compositing nodes are set up correctly
Check you have not set the viewport to local instead of global view