Dr. Phinney's lectures (Virta Health) are a good resource. Here's the first one, it's easy to find the rest:
Your fat sources should be nuts and olive oil and chia seed, with some cheese and egg.
Healthy food with lots of healthy fat.
The brain uses ketones as fuel, so you will find that hypoglycemia is easily handled. In ketosis, your brain will have plenty of fuel, even if your blood glucose drops too low.