I have three switches at my front door (front hall, outside, and upstairs lights). All work other than the front hall. Bulbs are good. Is there a problem with:
A. My switch
B. My light fixture
C. My wiring
D. Not enough information
If it worked before, and recently went bad, its likely the switch or the fixture. Having a tester of some sort would make diagnosing simpler, but you can do it without. Uninstall the switch and swap it with one of the others. If it still doesnt work, it wasnt the switch. To test the fixture, uninstall it enough to access the wires feeding it - depending on the fixture, you might not need to uninstall it all the way to get access. Connect a simple bulb socket to the wires. If it works, then it was your fixture. If thats also not it, then you need to call an electrician.
Obviously dont do any of this if youre not absolutely comfortable with electrical tinkering. As the joke goes, whats black and crispy, and hangs from a chandelier? An amateur electrician.
Even if you are, it makes no sense not to go out and buy a $10 tester to make this easier.