The actually tags are the least valuable portion of the meta-data (though still offer some significance). But that doesn't mean the tags listed in the Title and Description aren't valuable... whether or not those keywords are listed in the actual tags of the video or not.YouTube now says tags are of less value than they used to be. The new Studio has moved tags down to a pull down (default closed) at the bottom of the upload page. I have my standard channel tags that are part of my upload default, and I quit adding video specific tags about a month ago. So far I see no change one way or the other. I do not know if anyone has done any serious testing to see if they matter like they used to.
How do I write tags on my title and description