Prerequisite Mastery

The principle that advanced skills should only be attempted after foundational prerequisites are genuinely mastered — not just "covered." Skycak's summary: "Prereq yo' self before you wreck yo' self."

Why It Matters More Than It Seems

When you skip or incompletely master prerequisites, you don't just slow down on the advanced material. You create a vicious cycle:

1. You struggle with the advanced skill because prerequisites aren't automatic
2. Each step exhausts your working memory on prerequisites, leaving nothing for the higher-level task
3. You take so long that there's time pressure to move on
4. You arrive at the next level even less prepared
5. The cycle compounds — you get progressively more out of depth

It's not like a train that left the station late. It's like a train that isn't even moving — or may be moving backward.

Minor Potholes vs Uncrossable Chasms

With solid foundations, gaps in advanced material are minor potholes — you can push through with a bit of friction. Without them, the same gaps become uncrossable chasms that stop progress entirely.

This is why people give up on advanced books or courses and conclude "they're not smart enough" — when the real problem is missing prerequisites that are entirely fixable.

Prerequisite Knowledge is Intellectual Capital

Prerequisite knowledge is like financial capital: it compounds. Being well-practiced on prerequisites makes you look like a "genius" compared to peers who lack them — but it's just capital, not talent. The inverse is also true: if you have strong prerequisites but stop maintaining them, the advantage erodes.

Planning vs Execution Directionality

• Plan top-down: Use top-down thinking to map which prerequisite domains you need (e.g., "to do ML I need calculus, linear algebra, probability")
• Execute bottom-up: Actually do the learning from the foundational level upward

Trying to learn top-down (starting with the advanced goal and reverse-engineering gaps as you go) creates a roadmap full of unknown unknowns. You'll get stuck on branches you can't reach because you don't realize you're missing the climb below them.

"Filling In Your Foundations"

Filling in foundations transforms potholes → smooth road and makes you robust to omitted steps in advanced texts. Most "gifted" learners are just people with good foundational prep who correctly attribute their success to that prep (rather than to innate genius).

Sources

• Advice on Upskilling — Ch 9 (Learning), sections "Prereq Yo' Self Before You Wreck Yo' Self," "Filling In Your Foundations," "Plan Your Broad-Strokes Journey Top-Down," "Prerequisite Knowledge is Intellectual Capital"