I know nothing about it. Interesting.
Keto is a high fat, moderate protein, and low carb way of eating. It's based on the facts that sugar and carbs, which turn to sugar, are what causes weight gain and even feeds cancer.
Your body will burn it's easiest form of fuel for energy. Sugar is the easiest form of energy for the body to burn. So when it burns what energy it needs it stores everything else. What you do by eating keto is to remove that easy form of energy, sugar/carbs/etc..., which then makes your body search for the second easiest form of energy to burn, which is fat. So you feed your body healthy fats, olive oil/butter/avocados/etc..., and it will eventually become fat adapted, meaning that it's adapted to burning fat now for fuel instead of sugar/carbs, and it will also send you into what's called ketosis. It lowers your insulin, etc...
I eat twice a day within an 8 hour window and fast the other 16 hours (8 of which are sleeping), am never hungry in between meals, and am feeling amazing. The 16 hours that I fast is called intermittent fasting. It's actually unintentional. You get to a point where you just aren't hungry.
One thing that I read that really hit home to me was, "Is your stomach telling your head that you're hungry, or is your head telling your stomach that you're hungry?"
Now when I have cravings I actually analyze that and find out that it's mostly my head telling my stomach that I'm hungry which means that I'm really not hungry.
If you're interested, sign up for the free 30 day trial of Netflix and watch the documentary The Magic Pill. It does a better job of explaining it that I can.