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To write the best description for a YouTube video, you need to satisfy two "bosses": the YouTube algorithm (for SEO) and the human viewer (for engagement).
Here is the most effective structure to follow, according to current 2024-2025 best practices:
1. The "Hook" (First 150-200 Characters)
The first two lines are the only thing visible before the "Show More" button. Treat this like an ad.
What to do: Front-load your primary keyword and clearly state the value proposition.
Example: "Learn how to bake a perfect sourdough loaf at home—even if you've never touched flour before. This step-by-step guide covers everything from the starter to the final crust."
2. The Detailed Summary (The "Meat")
Write a 200–300 word unique description. This helps YouTube understand your video’s context to rank it in search and suggest it to others.
Write for humans: Use a conversational tone as if you're talking to a friend.
Secondary Keywords: Naturally weave in 2-3 related search terms. Don't just list them (avoid "keyword stuffing").
3. Chapters / Timestamps
Timestamps make your video "skimmable" and appear as segments in Google search results.
Format: 00:00 - Intro, 02:15 - Choosing your ingredients, etc.
Pro-Tip: Include keywords in your chapter titles to boost SEO.
4. Strong Call to Action (CTA)
Don't just ask people to "like and subscribe." Give them a reason to click a link.
Engagement: "What's your biggest challenge with [Topic]? Let me know in the comments!"
External Links: Put your most important link (newsletter, product, or lead magnet) immediately after the summary.
5. Social Proof & Related Content
Playlists: Link to related videos on your channel to keep viewers watching (this increases "Session Time,"