It’s a skill that takes practice and experience more than any golden tidbit of knowledge. Food is wide and varied, what works for one thing won’t work for all.
There are lots of general pointers, use more oil or, make sure the pan is hot first etc etc.
One of the biggest misconceptions that people have from Teflon is food sticking and releasing and worrying about that. With Teflon, at least when it’s good and new, nothing ever sticks, at any point, ever. This is not true of anything else. Your steak will stick, for a while, and then it will let go once the protein has cooked a bit. Your pancakes will need to cook for a while before you can get them to release from the pan etc.
Part of the skill is the implements you use and learning to release various foods from the surface. I like a wooden spatula for bulky things, but I also have a thin polyamide spatula for trickery stuff. The sharp edge on that helps a lot without damaging the pan. You can also use temperature changes to get food to release.
Lastly, sometimes some food sticks. Don’t sweat it. It’s still edible, don’t let it ruin your meal and learn as you go.
Excluding the rather silly clip on ring thing, all the TX type pots look to be plastic coated. Possibly not the kettle but I want access from the top. The Optimus terra range is great but again, stupid Teflon coatings on everything.
Also to the temp drop issue with gas, I didn’t watch the whole thing but a strong recommendation is to get a burner that can also run on kerosene for cold weather trips. Even propane sucks in the cold, liquid fuel will run rings around it.