Finding out if your website is indexed and also the date of when it was index is an important factor in determining whether or not on page changes have been picked up and cached by Google.
Although written in 2011, many of this is still relevant in 2017. Let’s face it, the Google algorithm cannot change that drastically otherwise the entire results will be totally different. Title tags are still on of the most important on-site factors which I go into more detail here. Next, meta description is also another important factor and must be implemented. One the most overlook and that is the actual content on the page. Read more about on-site factors in this blog post.