Flatten skill category directory structure

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+# YouTube Retention Optimization Methodology
+
+This document summarizes the core methodology for optimizing YouTube video retention, used to guide script writing.
+
+## Key Data
+
+- **55% of viewers leave within the first 60 seconds**
+- YouTube algorithm's most valued signals (by weight): Shares > Rewatches > Saves > Likes > Comments
+- CTR below 3% = problematic; 7-10%+ = strong
+- Average watch duration below 40% = algorithmic demotion
+
+## Three-Part Hook (0-30 seconds)
+
+The first 30 seconds are the make-or-break window. Use a three-part structure:
+
+### Grab (0-5 seconds)
+Capture attention using any of these approaches:
+- **Counter-intuitive fact**: "You think drinking 8 glasses of water is healthiest? Scientists say you're wrong"
+- **Shocking statistic**: "97% of people worldwide don't know about this feature"
+- **Visual impact**: Strong visual contrast or conflict
+
+### Promise (5-15 seconds)
+Tell viewers what they'll gain from watching:
+- "By the end of this video, you'll learn 3 methods you can use immediately"
+- "Today I'm going to tell you the secret that [industry] doesn't want you to know"
+
+### Stakes (15-30 seconds)
+Create a sense of loss for not watching:
+- "If you don't know this, you might already be making this mistake"
+- "90% of people wasted thousands of dollars by ignoring this one thing"
+
+## Pattern Interrupt (every 60-90 seconds)
+
+Viewer attention naturally drops every 60-90 seconds — you need to proactively break the pattern:
+
+### Visual Interrupt
+- Switch scenes (indoor → outdoor, close-up → wide shot)
+- Insert charts, animations, text effects
+- Change frame composition
+
+### Information Interrupt
+- Drop an unexpected fact: "But what you probably don't know is..."
+- Set up a mini-cliffhanger: "What I'm about to say next might completely change how you think about this"
+- Pose a thought-provoking question
+
+### Rhythm Interrupt
+- Suddenly speed up or slow down speech
+- Insert brief pauses (0.5-1 second)
+- Change vocal tone (narration → rhetorical question → exclamation)
+
+## CTA Placement Strategy
+
+### Soft CTA (at ~25% of video)
+- Approximately 60% of viewers are still watching — the optimal window for maximizing likes
+- Keep the tone relaxed and natural: "If you're finding this useful, drop a like and let's keep going"
+- Don't interrupt content flow — integrate naturally
+
+### Second Hook (at ~60% of video)
+- Critical point for combating mid-video drop-off
+- Preview the best content in the second half: "But the most important method hasn't been covered yet"
+- Create new suspense to keep viewers until the end
+
+### Hard CTA (ending)
+- Clear call to action: "Like, subscribe, and hit the notification bell"
+- Preview next video content, giving viewers a reason to come back
+- Only ~16% of viewers remain at this point, but they're the most loyal fans
+
+## Pacing Control
+
+- English speech pace: ~150 words/minute (natural conversational rhythm)
+- Slow down slightly before important information (for emphasis)
+- Speed up slightly for list-type content (to avoid dragging)
+- Each narration segment should ideally be 15-30 seconds
+
+## Retention Tag Reference
+
+Use the following tags in scripts to facilitate rhythm optimization during production:
+
+| Tag | Meaning | Suggested Position |
+|-----|---------|-------------------|
+| `HOOK` | Opening hook | First segment, 0-30s |
+| `PATTERN_INTERRUPT` | Pattern interrupt | Every 60-90s |
+| `SOFT_CTA` | Soft engagement prompt | At ~25% |
+| `SECOND_HOOK` | Second hook | At ~60% |
+| `HARD_CTA` | Hard call to action | Final segment |
+| `NORMAL` | Standard content | All other segments |