Many people focus on total carbs. I never had even a vague idea about my total carbs (I probably went over 100g on many days but who knows? :D), I only focused on net carbs. But when I realized I need a very low net carb intake, my total automatically went down and it’s the best. Sweeteners interfere with some people even if they don’t have net carbs. So figure out these things. I would start with net only, I think it’s the usual approach… Just keep in mind that maybe you will need to be careful with certain “keto-friendly” items…
Cheese is fine. Especially the mentioned ones, you should be more careful with the ones with more lactose.
Keto doesn’t ban anything, it just restricts your carb consumption. The carbiest items usually make little sense to eat (or in super tiny amounts… spices are typically very carby) but whatever floats your boat.
People say many things, I believe their advice work for them but for ketosis, you simply need to eat little enough carbs. It’s not even a fixed amount but 20g net works for most as far as I know. The rest is up to you, we are all individuals and different keto styles work for us. My original keto gave me fat adaptation but no fat-loss or more energy, I need a different approach for them so even our goals matter when we choose our woe.
Your gouda should be 0g carbs and that’s it, the data used by the app must be super bad or something… I eat gouda myself, it’s 0g net and total carbs…