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Foundations

The mental models that make everything else click.

Context windows, tokens in plain English, and why more context = better output.

The decision matrix for which Claude product you actually need.

Role, Context, Task, Format, Constraints — the RCTFC framework.

How to give Claude persistent context across conversations.

7 anti-patterns and how to fix them.

Opus vs. Sonnet vs. Haiku — when to use which.

What Claude can see, data retention, and when NOT to use AI.