Learn YouTube Download & Transcription

I am looking for assistance in learning how to download and transcribe YouTube videos, specifically focusing on public videos. My goal is to use this process for personal use and archiving purposes. The guidance should be practical and step-by-step so I can easily replicate it on my own. Since I need to get started as soon as possible, I'm hoping to quickly gain the necessary skills to manage this effectively. If you're experienced in this area and can provide clear, actionable instructions, I'd love to work with you.