Three sections. The first maps eight everyday frustrations to the right fix: a convention Claude keeps getting wrong goes in CLAUDE.md, a prompt you keep retyping becomes a skill, a system you keep copying from becomes an MCP server, and so on. The second sets four look-alike mechanisms side by side (CLAUDE.md, skill, subagent, hook) by what they are, when they load, what they cost in context and what they are best for, with a note on why a rule in prose is a request and a hook is enforcement. The third is eight prompting moves, in the order worth trying them, from being clear and direct through to evaluating against a golden set.