Replacing flourescent with LED
The red wire should be the switch leg coming back from the switch.

The whites are all connect d so that appears to the neutral as it should be. Grounds are good. The two blacks should be one hot from the panel and one feeding the switch.

Take the switch apart and verify it is fed with a black and has the red on the other side of it. If so then connected your new light to the white and the red.

You should get a meter and verify your wiring if you are going to tpdo electrical work.

Good luck and stay safe!