Search engine optimization for YouTube is the everevolving practice of optimizing YouTube videos, titles, descriptions, and more to rank well in YouTube's internal search engine and Google as a whole. Best practices include adding key terms to titles and descriptions, finding the optimal video length, promoting your videos on other channels, and paying attention to your metrics.Perform keyword research to see what topics your users are interested in, then include those terms in your titles and video descriptions. Create useful content your audience is likely.After Seo, videos gain organic traffic from YouTube search and this audience is a very important for a growing channel. Because this audience attracted by your content. I am using Tubebuddy tool for my working. Using this tool I tried to seo score of video is 90, 95 and sometime full 100

Remember that my working on videos seo includes title, video description, keywords research, screen card, end card and thumbnail.