In my experience getting in to ketosis and becoming a fat burner was tough. I think a lot of that is because my metabolism was ruined from years of yo-yo dieting and became very resistant. So it has taken quite a while to "reset" everything. Sometimes I still come out of it for unknown reasons which is very frustrating. Stress and hormones can affect it. Need to keep those cortisol levels down. But the benefits are amazing. Not feeling hungry is life changing when you're a binge eater!
My advice when starting is to keep it "clean" and simple. Find out your macros for your current weight and goals. Carb Manager app is my recommendation. Then, basically, pick a lean meat, pick some veg, and pick healthy fats up to those macros limits. Track everything until you know for sure what "30g of whatever" actually is. Always weigh your carbs.
Make sure to leave at least 5 hours between meals so you burn your own body fat in between. The longer the better so try not snack. It works even better if you do intermittent fasting along side it. This can be as simple as skipping breakfast a couple of times a week so you have a 16hr gap between meals.
The purpose of keto is to minimise insulin spikes and lower inflammation. So stay away from anything with any kind of added sugar in the ingredients list and minimise ingredients that are pro-inflammatory (those high in omega-6s, for example). This is why this way of eating is really beneficial for people with T2 diabetes, PCOS, psoriasis, arthritis etc. Weight loss is just a side effect of eating healthier and using fat as your primary fuel source.
Yesterday, for breakfast I had smoked salmon and scrambled eggs. Lunch was roast chicken with lettuce, tomato, olives, avocado, boiled egg and mayo. Dinner was teriyaki stir fried beef and mushrooms with broccoli, cauliflower and roasted asparagus.
How can people say that is unhealthy and dangerous??
There is a lot of ignorance surrounding keto. It is not unlimited amounts of cheese, bacon and butter. That is the "dirty keto" people talk about. Best practice is to choose low-fat/fat-free items then add healthy fats yourself. Olive oil, coconut oil/cream, ghee, eggs, avocados, (high omega-3) nuts, olives. Be careful with dairy. After you master the basics maybe try introducing the cheat stuff if you still want to. You'll know better what your body can tolerate by then.
Good luck!