Vent fan works but not light

I changed the light bulbs and now the lights won’t work! The vent fans still work fine. I didn’t think I would ever be part of the joke “How many ______does it take to change a light bulb” Please Help

If you have a meter, set it for 200VAC. With the light switch on, carefully place one probe in the center of the lamp socket, and touch the other to the threaded side. Don’t let them touch each other. If you don’t get 110 (or so), either the socket connections are broken or otherwise fouled, or you have a bad switch.