Away from special exceptions, causing your own ball at rest to move normally costs one penalty stroke.
Plain-language guide · Rule 9.4. Use the current official text and your round’s Local Rules for a ruling.
What to know
Replace it on its original spot. Accidental movement during a fair search or on the putting green is treated differently.
On the course
If you bump your ball in the fairway while addressing it, do not play from the new spot. Check the cause and apply the correct procedure.