ADD SUBTITLES & TRANSCRIPTS TO YOUTUBE TO HELP WITH VIDEO SEARCH ENGINE OPTIMIZATION
You can hope that Google and YouTube guess what your video is about or you can tell them! Video Search Engine Optimization is the process of letting search engines know what your video is about so the search engine can show your video based on your keywords. Every video you add to YouTube should include tags and a title that specifically describe your video. Google and other search engines will use those tags and titles to index your video.
Tags help but if you want Google to know exactly what is being said in your video you can simply add subtitles or a transcript to your video with the exact words being spoken. If you create a video about green tractors and the people in the video speak a lot about green tractors your video is much more likely to show up in Google and other search engines. If the subtitles / transcript has many instance of the words ‘green’ and ‘tractor’ Google will know exactly what the video is about.