I use VidIQ to find out what tags the bigger Youtubers are making. And here's one I found for Buzzfeed.
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The key is not posting too many tags. But posting too many tags saying the exact same keyword rather than using a related word to the topic of the video. Like what Buzzfeed is doing.
So you do want to post a lot of tags with the exact same keyword OR you do not want to do that, AND instead use a related word to the topic?