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I read article about how some young people are using tiktok to search for stuff instead of google. If they want to check out a restaurant or an event they would see if someone made a tiktok of it.

You are probably very correct! I don't use TikTok, but I noticed TikTok second-hand, via YouTube's heavily promoted Shorts.

depends on the how-to, if it's how to not ruin a dress shirt in the washing machine sure. If it's a technical in depth subject Youtube is the place to be, you can't learn systems programming on your smart phone in a minute.