Skip the fundamentals and they’ll show up later with interest, like an unpaid bill.

Skipped basics do not disappear, they accumulate. Every later technique quietly assumes the earlier one, so the gap sits underneath everything you build and gets more expensive to fix as more is stacked on top. When it finally surfaces, it rarely looks like a missing fundamental. It looks like being mysteriously bad at the advanced thing.

If something at your level keeps failing for reasons you cannot name, go back further than feels dignified. Check the boring first steps you assumed were fine. Repairing a foundation is dull work that removes a surprising number of unrelated-looking problems.