Sorry, I'm understanding now that you are replacing a ceiling fan light combo with just a light. I think what you'll find is very simple wiring and no extra wires because the current fixture operates on one switch.

Game plan: Turn off power to the fixture at the breaker box.

Disassemble the current fixture before removing it from the ceiling. This means removing the ceiling fan blades, any lightbulb cover(s) & lightbulbs, probably nothing more.

Unscrew the fixture from the ceiling and carefully pull it off the ceiling mount so the wires are exposed. You might see a small hook on the ceiling mount that allows you to hang the fixture from it from a hole at the top of the fixture (maybe a screw hole or other hole in the rim of the top of the fixture). If you see that, hang the fixture from it to free your hands. If you don't see it, you might want a helper so you don't have to balance the fixture in one hand while working the wires with the other.

Use an electrical tester to run over the wires and make sure there's no current going through them.

Take pictures of the existing wiring. Carefully note which colors from the ceiling fan are twisted to what colors of wires from the house wiring. If you are confused at this point you might want to stop here, post your pictures in a new thread and ask any questions you have.