Areeb Mirza advises creators on using the first few seconds of short-form videos as a hook to capture attention (the first 4–5 seconds). He notes creators may use others' footage or memes if they get results but emphasizes that after hooking viewers you must deliver the promised entertainment or value.
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I think at this point everyone and their dogs know what a hook is and how to structure the start of the video. If you don't know, basically the first five seconds of any short form clip is where you need to put a lot of effort on whether it's you wanting to go viral or speak to a target market. Doesn't matter how you do it, but as long as you do it. Some people straight up use someone else's footage, memes, etc to capture attention and my thing is if it works, it works. Do I recommend that? I can't say. But if it's bringing you the result you wanted from it, good. But don't just stop on the hook, actually deliver on what you're going to say. You invited them with the hook, they accepted it. Now it's your job to show them what they came for. If it's entertainment, it's entertainment. If they're expecting value, give them value. Just give them what they want.