A Web page title is the name or title of a Web site or a Web page. It is a plain text title or header Tag which is displayed in the Title bar in your browser window and it is displayed when you bookmark a page or add it to the browser favorites.
Meta Descriptions are the concise explanations for the content in the web pages. Meta description is the description of the web page. Meta description is kept inside the head tag in the page. We write Meta description for the Google to understand the contents of the page.
Meta keyword tag is a brief and concise list of most important parts of your web page.
Header tags (H1, H2, H3 …) are the second most important On Page SEO factor that you can use to get better Search engine results pages. If leveraged properly, H1 & H2 headers can be very effective in helping to shape search engines perception of your pages content.
Images are an essential part of any Web page and from a designer point of view they are not an extra but a most mandatory item for every site.
Images cause a very unique problem with web crawlers. A search engine web crawler doesn't have the ability to view and image on the web and inherently know what that image is depicting. In other words, unless we (the webmasters and SEO's) help them out, they are blind as a bat!