From Where These YouTubers Search the Content

I Want to create the Content Like That: Hello Friends i want to start a YouTube Channel on TOP 10s. I am researching on these from last week and i did't find the content great enough to satisfy the viewers. I did not even able to find out the content that YouTubers Already Posted . Anyone help me in how i can find the content about TOP 10s.
I tried so many keywords on Google about TOP 10 this or that but the content appears is not so much interesting and only Pictures i saw. I want to create the Content like :

8 Dangerous Attacks of animals on Humans
10 Coolest Gadgets

I tried these on Google but Videos appear which already created by someone else. How i can cover these topics please guide me if you have any idea.

Have a look what's trending. Grab some editing software and there you go.

Just re-create what already exists but in a different way. 99.99% of all ideas are taken already.

KingBoris said:

Have a look what's trending. Grab some editing software and there you go.

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Trending on YouTube or another Platform?

mrtruehybrid said:

Just re-create what already exists but in a different way. 99.99% of all ideas are taken already.

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I also think so. Is there any issue if i use another's Video with my Own Voice Over in another Language.

Sheraz Ali said:

I also think so. Is there any issue if i use another's Video with my Own Voice Over in another Language.

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Yes

You will see some of those youtubers provide credit or source links in their video descriptions. You can find fresh videos on many other popular content sharing sites like reddit. Also you can search on foreign (non-english) sites for videos that are not so common. I think the video you shared are clips of various concept products/technologies. These kinds of short concept product/service/technology/gadget videos are usually found on fundraising/investor seeking sites.

mrtruehybrid said:

Yes

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What is the Issue so?

Sheraz Ali said:

What is the Issue so?

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Because the video will not be unique.