It's called Just Write. I just discovered it today but the two videos I've watched are extremely helpful and interesting, especially in character building. Highly recommend this as a resource for aspiring writers! https://www.youtube.com/channel/UCx0L2ZdYfiq-tsAXb8IXpQg
Really helpful youtube channel for writers!
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Another good writing channel is Hello Future Me. He does writing videos, reviews and analysis on tv shows' systems and theories. It's really good.