Thumbnails can be screenshots from the video content or they may be created separately to advertise the video. If your thumbnail is boring, blank, or difficult to make out, people may not click your video. All video sharing sites, including YouTube, allow you to pick from several different thumbnails from your video. While the default choice might sometimes be perfect, it often isn’t. Take a moment to consider all of your options and choose an image that represents your video well.
Page Structure - The third core component of SEO is page structure. Because web pages are written in HTML, how the HTML code is structured can impact a search engine’s ability to evaluate a page. Including relevant keywords in the title, URL, and headers of the page and making sure that a site is crawlable are actions that site owners can take to improve the SEO of their site.
Google's search engine marketing is one of the western world's marketing leaders, while its search engine marketing is its biggest source of profit. Google's search engine providers are clearly ahead of the Yahoo and Bing network. The display of unknown search results is free, while advertisers are willing to pay for each click of the ad in the sponsored search results.