Act as a [professional VFX artist] with [5+ years of experience in AI-driven video effects]. Create a step-by-step tutorial on how to use AI tools like [Runway ML], [Topaz Video AI], or [Adobe Firefly] to generate stunning nebula effects for YouTube videos. Cover [workflow optimization], [customization tips for color and density], and [seamless integration with editing software like Premiere Pro or DaVinci Resolve]. Explain how to tweak AI parameters for [realistic cosmic textures], [dynamic light simulations], and [smooth transitions between scenes]. Include troubleshooting advice for common issues like [render artifacts] or [mismatched lighting]. Aim for a beginner-friendly yet detailed guide that helps creators elevate their sci-fi or fantasy content.