The more advanced the level of knowledge on something the more foundation knowledge somebody has to have to even begin to understand things at that level.
It would be pretty insane to in a tutorial for something at a higher level of expertise, include all the foundational knowledge to get to that level of expertise so that an absolute beginner can understand what's going on.
Imagine if you were trying to explain something Mathematical that required using Integrals and you started by "There this symbol, '1' which represents a single item, and if you bring another single item, this is calling addition - for which we use the symbol '+' and the count of entities when you have one single entity and 'added' another single entity is represented by the symbol '2'. There is also the concept of equality, which means two matematical things represent the same and for which the symbol we use is '=' - writting this with Mathematical symbols, '1 + 1 = 2'" and built the explanation up from there all the way to Integrals before you could even start to explain what you wanted to explain in the first place.
That said, people can put it in "recipe" format - a set of steps to be blindly followed without understanding - but even there you have some minimal foundational knowlegde required - consider a cooking recipe: have you ever seen any that explains how does one weight ingredients or what is "boiling" or "baking"?
So even IT "recipes" especially designed so that those with a much lower level of expertise than the one required to actually understand what's going on have some foundational knowledge required to actually execute the steps of the recipe.
Last but not least I get the impression that most people who go to the trouble of writting about how to do something prefere to do explanations rather than recipes, because there's some enjoyment in teaching about something to others, which you get when you explain it but seldom from merely providing a list of steps for others to blindly follow without understanding.
So, if one wants to do something way above the level of expertise one has, look for "recipe" style things rather than explanations - the foundational expertise required to execute recipes is way lower than the one required to undertand explanations - and expect that there are fewer recipes out there than explanations. Further, if you don't understand what's in a recipe then your expertise is below even the base level of that recipe (for example, if somebody writes "enter so and so in the command prompt" and you have no fucking clue what a "command prompt" is, you don't meet the base requirements to even blindly follow the recipe), so either seek recipes with an even lower base level or try and learn those base elements.
Further, don't even try and understand the recipe if your expertise level is well below what you're trying to achieve: sorry but you're not going to get IT's "Integrals" stuff if your expertise is at the level of understanding "multiplication".