There really isn't a lot to explain. There are two basic types of Keto diets one of them is the CKD where you keep carbs below 30 Monday through Friday and then eat carbs on the weekend. Then there is the just straight low carb diet (which I am on). I try to stay below 20 gr. of carbs a day. I here that you can do this for to long and screw your world up. I have been on it for over 3 weeks now and have noticed no ill effects as of yet. I will probably begin to do some variation of the CKD just so my body can see somthing diffrent.
The low carb diet consist mostly of eating meat, cheese, and some veggies. Meat has no Carbs, most cheese has verry little and some veggies have a lot. I don't remember where they were but there are several post on here with links that tell you all about the science and greater detail about the diet. Also the Atkins Diet book is a good source of info on the diet.