Master GPT-5, Claude 3.5, Gemini 2, Veo 3, LangGraph, RAG, Tool-Calling & Production AI in 2026. Prompt Engineering is the #1 fastest-growing AI skill in 2025–2026 (average salary $135k–$335k globally). This ranking uses real Udemy data as of November 21, 2025. All courses include lifetime access, Udemy certificate, …