Saturday i took my valve cover off to paint it and when i put it back on my car wont start the starter turns but it doesnt start i checked everything fuses fuel pump i changed my fuel filter and im still not getting spark today im going to change my cap and rotor today but i dont know what it could be im at loss need help please

Look at your work you probably unplugged something.

Check to see if you unplugged something or detached a ground