30 days gives you functional competency — the ability to use a skill in real-world context at a basic to intermediate level. Four phases: Days 1–7 (Foundation — learn the 20% that produces 80% of results), Days 8–14 (Guided Practice — structured exercises, make things, encounter friction), Days 15–21 (Independent Application — drop tutorials, start your own project), Days 22–30 (Consolidation — finish the project, document it, use spaced repetition, plan the next 30 days). Non-negotiables: daily 30–60 minute sessions, no passive consumption, one skill only, public accountability.