Why are posters telling the OP how to change out the breaker when nobody knows if that’s the problem. IMO, a bad breaker would be the last piece I would look at replacing.
Do we know if the breaker has been reset? How about the secondary test button/switch on the breaker? Most circuit breakers made in the past decade or more have a test button/white switch on them that can reset. I’ve had to replace some of these for garages because they will flip too easy when hooking up air compressors or worm drive saws with high amperage ratings. So not only you can switch the main breaker on/off, you can press this test button/white switch on the breaker on/off too.
I have a test pen that beeps when close (not touching any wires) to a hot wire so what I can do is take off the switch plate on the switch for the lights that don’t work, and with the switch off (not a 3-way circuit), you should have the pen light go on pointing to either the top or bottom screw on the side of the switch. If you don’t have power to either screw, then you don’t have power coming in to the switch. If you do have power coming into the switch, then after you flip the switch on, you should have power going to both screws on the switch. If you don’t, you have a bad switch. This is not for a 3-way light circuit.
Also, I’m not telling you to do any electrical work or that you should touch any electrical wires, you should hire this out. Do not use the old fashion pins to test your circuits, only use the test pens with the plastic tips so you can’t create an arc.
To be safe, hire any job out that you don’t understand, especially electricity and natural gas
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