Solid roundup. The resources that moved the needle most for me were Anthropic's prompt engineering guide and the LearnPrompting.org cookbook — both are grounded in actual model behavior rather than vibes. One underrated resource to add: reading the system prompts of open-source agent frameworks (CrewAI, AutoGen, Aider) — they're basically master classes in how to structure instructions, tool descriptions, and guardrails. Are there any India-specific prompt engineering communities you'd recommend? Most of what I find is US-centric.