Hi where I started is finding Thomas De Lauer on YouTube. He used to be huge and used keto to slim himself.. he does supermarket trips and such to show what foods you can eat. Then I watched others including doctors. Also try LisaLisaD1 who had used it to fix digestive issues during menopause, and slim.
Then rather than recipe books I decided to buy food and plan basic meals, and try to figure out how much this approach was going to cost me. I mainly shop at lidl, so say I buy a big pack of chicken I might have 1 a week, I have a geeky spreadsheet figuring out cost over a month.
Honestly, I tend to graze not so much stick to a plan. Example days
Today
Breakfast : 2 strong coffee, uht milk
Mid morning : about 10-15 Brazil nuts
Lunch : two thirds pot cottage cheese
2 squares dark chocolate
Dinner : tbc...
Yesterday
Breakfast : same as above
Mid morning : about 150g pistachios
Lunch : 100g cream cheese
Dinner : large chicken breast in butter, extra large avocado, 100ml creme fraiche
2 squares dark chocolate
You need low carb foods so eggs, meat, fish, cheese, butter, nuts, green veg...
The thing about keto is it kind of reduces your appetite. You don't crave like you do with carbs, and I am someone who was always hungry.
I need to tweak my approach, probably eating too much cheese.. I either eat a whole head of broccoli or not enough veg some days. I'm eating more than the 20g carbs for real keto, more like 30g. And have had a couple 70g days. But I'm still losing 2lbs per week consistently now.