Your website won't appear in search enginges if it can't be indexed. If your page explicitly blocks indexing by search engine crawlers, then it won't be included in search results. Learn how to tell if your page is being indexed.
If you want your page to get found online, it's best to include an optimized meta description. Search engines want to surface helpful and relevant pages to user quires. Including a meta description is your way of telling search engines what your page is about. Learn more about the document does not have a meta description error.
If you want to get found online, you'll want to avoid using Java or Flash plugins. These plugins can't be indexed by search engines, so they actually don't help you increase organic traffic. Learn more about the Document Uses Plugins error.
Links are important for both users and search engines. They allow users to understand what the link is and what they should expect to receive by clicking it. Similarly, they tell search engines what the link content contains. Learn how to solve the Links Do Not Have Descriptive Text error.