So, let imagine, that you have already known how to research keywords and optimize video by exact keywords from this our guide – kparser.com/youtube-keyword-tool
For researching channel keywords we use similar methods. Only we keep in mind, that we need relative to our context keywords, which are describe our channel the best. Check the screen above with “Introducing Google Home” video one more time. You’ll find, that Google team use long tail keywords for video, but very general keywords for channel (like Google, Technology, Science, Android, Google App, Drive, Gmail etc.). Is it correct way? We guess only in some cases. The scale of your channel really matters. But generally, the best way is to use keywords with 2-4 words. For example if you want promote channel only by Google Home product, you can test such tags as google home page, google home automation, google home setup, google home review etc. Of course you will use such keywords in your videos too. But for one video you will use a lot of long tail suggestions for 1-2 channel keyword.