I’m not sure that keto and IF changes your schedule, it just changes what you eat.
There are lots of keto web-sites, but for me Keto is really about reducing your carb and sugar intake down to/as close to zero as possible. Meats, cheeses, salads are good, pasta and rice are bad etc.
Sugar/carb intake spikes insulin, which inhibits ketosis. Avoiding sugary creamers in coffee in the morning is also helpful.
There are keto foods that have carbs, they just don’t have very many. Effectively keto keeps you in ketosis during most of your 8 hour eating window because if you don’t eat carbs/sugar, your body keeps using ketones/body fat for fuel once it has digested the calories from the proteins you are consuming through keto diet. If you reduce to 23:1 then you are in ketosis that much longer, which in turn burns more ketones/body fat. Of note, make sure you are still consuming enough vitamins and calories to maintain your health.
If you work out and do 23:1, if possible eat after you workout.