Google loves new content!
When you search for information about anything - do you want to see the newest info on that subject? Of course you do.
Google is also continually striving to give the best possible search results. They also recognize that the latest and newest information about anything is probably the most accurate. So Google gives priority to new fresh content. Google loves new content. When Google visits your site it can see when the content was last changed. The more often you change it - the more regularly Google will decide to visit.
What this means is that web sites with old content get left behind in the search results. Sites with fresh content get moved to the front. If you want your web site to perform well - change the content as often as you can.
Sure, this is not the be all and end all of Search Engine Optimization. We have been doing SEO since the term was invented - and it is a very involved and constantly changing process. There are many factors involved in good page ranking. But you don’t need to get involved with all that.
Use the best search phrases and keywords in your content - and change your content regularly.