Most fundamentals curricula over-teach the wrong things.
The standard "fundamentals" list — perspective, form, value, color, composition, anatomy — is correct in the abstract and misleading in practice. It implies equal weight and sequential mastery, and neither is true. You can draw professionally with shaky three-point perspective if your construction and form-simplification are strong. You will struggle forever with weak construction, no matter how perfect your perspective drills are.
The seventeen resources here, almost all from Nsio's deviantArt series, make a coherent argument about what actually matters. Read them as a curriculum, not a list:
Construction is the load-bearing fundamental. Nsio's "Understanding 3D," "Simplifying the Complexity," and "Constructing and Analysing" teach you to see everything as primitive forms (cubes, cylinders, spheres) and build outward. This is the skill that makes every other fundamental easier. If you only study one thread, study this one.
Perspective matters less than distortion-awareness. You don't need to render flawless three-point perspective. You need to notice when your perspective is distorting and fix it — which is what Nsio's "Distortion in Perspective" actually teaches, despite the broader title.
Line quality is undersung. "Line Dynamics" gets one entry here and deserves ten. Expressive line weight is the difference between a drawing that feels alive and one that feels traced.
What's over-represented in most fundamentals advice: exhaustive perspective grids, color theory before you can construct a form, composition rules memorized as checklists. This collection quietly corrects that weighting. Follow its order.