Remove ceiling fan/light combination replacing with a light and remove 1 of 2 switches that controlled the ceiling fan
It looks like you have a pretty &quot;normal&quot; setup:

Black (hot) &amp; white (neutral) come in from the panel.
Black (switched hot), red (switched hot) and white (neutral) go from the box to the fan/light.

What you should find, but is not 100% clear from the picture, is a wire nut connecting three black wires - incoming from the panel, light switch, fan switch. Assuming you can find that connection (because if you can't then we need to figure out what is going on before doing anything else):
In the switch box

Remove the pigtail that used to go to the fan switch.
Cap the other black wire from the fan switch - you won't be using it.
Use the existing light switch (unless you want to switch a Decora style or a smart switch) - no change needed to that switch in the box.

In the ceiling box

Cap the incoming black wire - this was for the fan and you won't be using it.
Connect the red wire to the new light's hot (typically black) wire.
Connect the white wire to the new light's white (neutral) wire.
Connect all grounds together. New light ground may be green or bare.