Start at the real hook. Remove greetings, housekeeping, and references that only make sense inside the full recording. A new viewer should understand the subject and reason to keep watching almost immediately. Begin near a question, claim, mistake, conflict, demonstration, surprise, or result.
Keep one complete idea. Short does not mean incomplete. Include enough context and evidence for the moment to be fair. End after the answer, lesson, result, emotional beat, or punchline lands. Do not cut mid-sentence merely to hit an arbitrary duration.
Review the entire vertical crop. A face may be centered at the beginning and move later. A second speaker, product, presentation slide, screen recording, or gesture can disappear under a fixed crop. Watch the whole output at normal speed before publishing.
Correct captions on a real phone screen. Check names, numbers, brands, technical words, punctuation, and timing. Use short readable lines, strong contrast, and a position that avoids faces and the interface areas used by captions, buttons, descriptions, and navigation.
Package for the destination. A YouTube Shorts title, Instagram cover, TikTok caption, campaign disclosure, and call to action serve different contexts. Reuse the core clip when appropriate, but review every platform version rather than assuming one upload fits everywhere unchanged.