The step by step how to not being available is due to the fact that companies make money from having “the best tech”. This knowledge will never be freely available in a step by step form, but most of it IS available in concept form if you go looking for it.
If the knowledge was freely available, all games in that genre would be identical, or only slightly different. A step by step tutorial would also mean we would have thousands of “shovel-ware” games that have no story, nothing interesting, only created because it is possible to create and sell it.
Companies spend a lot of money developing these mechanics, they are not going to give them away for free.