Description: Two things to keep in mind here: 1) start your description with a full URL, and 2) don’t be stingy with your description—more is… well, more. Be as descriptive and keyword-rich as possible. This will help you get found more easily by people searching YouTube for your type of content. You can also include more URLs throughout your content.
Not only do subtitles and closed captions help viewers, but they also help optimize your video for search by giving you another opportunity to highlight important keywords. You can add subtitles or closed captions by uploading a supported text transcript or timed subtitles file. You can also provide a full transcript of the video and have YouTube time the subtitles automatically, type the subtitles or translation as you watch the video, or hire a professional to translate or transcribe your video.