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Knowing how to code is not the same as knowing what to learn next for an FDE. When you're building and shipping a small application, eight skills can feel like unrelated buzzwords. This is one creator's take, not an official standard-but the order tells a story. Start with Python for software, and SQL for working with data. Then use APIs and microservices with FastAPI, so your app can serve functionality. Next, learn GenAI and LLM fundamentals before jumping into tools. Add LangChain for building language-model workflows, then LangGraph for connecting workflows. RAG-retrieval-augmented generation-helps use information, while vector databases help store and find it. Finally, learn AI agents that can carry out multi-step tasks. The pile is a stack: foundations, services, AI, then complete application systems. Use this checklist: Python, SQL, FastAPI, GenAI and LLM fundamentals, LangChain, LangGraph, RAG, vector databases, and AI agents.