My window is 12:30 to 8:30, so I eat lunch, maybe some snacks in the afternoon, and then dinner. I usually try to get one more snack in right at 8:30, too. No other dietary changes, like high protein or low fat or anything; the lunch, dinner, and snacks are all normal food.

I do find that my concentration has improved in the morning, as I'm not digesting a big breakfast. I start to get a bit hungry around 11:00, but (as you'll read about if poke around the forums and such) it's not a "Ohmigod, I'm going to die!" type of hunger, but more of a "Okay, almost there. Just focus on working for another 90 minutes" hunger that kind of feels good.

Lastly, when people discuss IF, you'll hear a lot of theories about why it works, how it works, what's the best way to IF, including in this thread. But don't try to overthink it, and just try it yourself for a week. Skip breakfast, don't snack after dinner, (optional) go to bed at a reasonable time. If you don't like it, or you're not losing weight[0], then go back to your former routine. Not a big deal.

[0]But I've never heard of anybody not losing at least 1-2 pounds that first week.