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Youtube tags and other kinds of Youtube metadata can be so overwhelming, but it really doesn't have to be. You can search all day online about how to get the "best" tags for your videos, but at the end of the day, you and all the gurus have literally no idea whether you're grasping at straws or not.
That's why My Video Tagger takes the tags from successful Youtube videos and lets you select from them. That way, you know that the tags you're selecting from have a proven track record to work. When you Enter your video name/topic, you are presented with a list of videos in that same category. These are literally the same videos you'd be competing with when you video goes online. So even if you don't want to use their tags, you can see what they are trying to do by looking into their tag list.
Good luck everyone!