Search Engine Spiders – While automated spider visits are the most common norm, if you have a new website, you can have a spider visit your website by simply submitting your website to your choice of directory.
Site Maps - sitemap is actually a list of pages that exist on a web site. That list is usually hierarchically organized and broken down into logical parts.
Text vs. Image - The drawback of embedding significant textual content as part of an image is that it is not accessible to search engines to consider such embedded textual content for presenting in search results. This is because such embedded content is simply inaccessible to search engines.
Relevant Content - The search engines will in fact check your keywords, and then compare them to the relevant content with in the site and the title of your website. So this is why relevant content is important.