Off topic but I don't think breakfast is any more or less important than a meal any other time of the day. Most days I only eat one big meal around dinnertime and maybe have a few bites of some snack throughout the day. I've been like that for years now it started from doing 12 hour construction shifts where I'd just work all day with a coffee and maybe an apple or something then eat a big meal once I was home. I don't do construction anymore but the way I eat stuck with me. It's probably worth pointing out that I'm very fit and a healthy bodyweight (5'10 152lbs) and I don't suffer any negative effects from living like this. I'd say I'm healthier than 90% of the people I know.
16/8 is the most common intermittent fasting protocol for begginers. 20/4 is recommended in case of autoimmune disease, to reverse leaky gut and insulin resistance.