Because drawing is so many things to so many people, I don't think it's something that can be as a philosophy "taught". However, technical skills and knowledge can be taught. Approaching art as an illusionist (to create the illusion of reality and/or suspend disbelief), learning can be usefully condensed sometimes; the trial and error pared down. These tutorials and references are the aggregate of my topical knowledge.
Also: everything is art, and 'good' or 'bad' as a measurement of art is useless without an axis of comparison. There is no 'implied' or 'obvious' axis 'to anyone with any taste'. (I criticize the idea of 'inherently bad art' as it's historically a discriminatory notion--pay attention, especially to the 20th century. Making fun of literally little kids' art on deviantART is pretty cheap, as well.)
I don't like the presumption that 'art' is visual art, because of my viewpoint that everything is art. Even among people who don't hold this viewpoint, things like music, architecture and poetry are still called 'art' but the word 'art' alone usually brings to mind paintings. This is contradictory and biased in a way that I think is dangerous to art, since a lot of art is exploring what 'art' actually is or means.
So I use these words instead:
Physical media: Art that doesn't rest encoded in electronics. Paintings on canvas, or a bronze cast sculpture, are examples. So is a digital image that's been printed out, or a 3d printed sculpture; those were made in digital media and rendered into physical media automatically, like a 3d render being made. Some people call this 'traditional media'.
Digital media: Art that is encoded in an electronic device of some sort, and requires that 'brain' to be presented in a comprehensible way to (most) peoples' senses. Examples are a 3D mesh (that hasn't been printed), a painting in Photoshop, or a mixed-media art installation that requires an Arduino to function.
Rendering: The work, either automated or manual, that is involved in bringing a visual illusion or project from the most basic skeleton-- whatever shape that skeleton might be-- to its finished state. Examples: Literally rendering a scene in Blender; painting the shadow and detail onto a form imagined on a canvas; rendering a basic script into a more full-featured and friendly one.
Everyone should read Arne's tutorial at least once.
Pinterest is a goldmine because it's where moms and college art students collide.